The difference between Away and Off
When used as adverbs, away means from a place, hence, whereas off means in a direction away from the speaker or object.
When used as adjectives, away means not here, gone, absent, unavailable, traveling, whereas off means inoperative, disabled.
Away is also interjection with the meaning: come on!.
Off is also noun with the meaning: beginning.
Off is also verb with the meaning: to kill.
check bellow for the other definitions of Away and Off
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Away as an adverb:
From a place, hence.
Examples:
"He went away on vacation."
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Away as an adverb:
Aside; off; in another direction.
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Away as an adverb:
From a state or condition of being; out of existence.
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Away as an adverb (as imperative, by ellipsis):
Come away; go away; take away.
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Away as an adverb:
On; in continuance; without intermission or delay.
Examples:
"sing away'"
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Away as an adverb:
Without restraint.
Examples:
"You've got questions? Ask away!"
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Away as an adverb:
Being so engaged for the entire time.
Examples:
"That's where tourists go to hear great Cuban bands and dance the night away."
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Away as an adverb:
At a distance in time or space.
Examples:
"Christmas is only two weeks away."
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Away as an adjective:
Not here, gone, absent, unavailable, traveling; on vacation.
Examples:
"The master is away from home."
"Would you pick up my mail while I'm away."
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Away as an adjective (following the noun modified):
At a specified distance in space, time, or figuratively.
Examples:
"He's miles away by now."
"Spring is still a month away."
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Away as an adjective (chiefly, sports):
Not on one's home territory.
Examples:
"Entrance for away supporters."
"Next, they are playing away in Dallas."
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Away as an adjective (baseball, following the noun modified):
Out.
Examples:
"Two men away in the bottom of the ninth."
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Away as an adjective:
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Off as an adverb:
In a direction away from the speaker or object.
Examples:
"He drove off in a cloud of smoke."
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Off as an adverb:
Into a state of non-operation; into a state of non-existence.
Examples:
"Please switch off the light when you leave."
"die off'"
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Off as an adverb:
So as to be removed or separated.
Examples:
"He bit off more than he could chew."
"Some branches were sawn off."
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Off as an adjective:
Inoperative, disabled.
Examples:
"ant on"
"All the lights are off."
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Off as an adjective:
Rancid, rotten.
Examples:
"ant fresh"
"This milk is off!"
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Off as an adjective (cricket):
In, or towards the half of the field away from the batsman's legs; the right side for a right-handed batsman.
Examples:
"ant on leg"
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Off as an adjective:
Less than normal, in temperament or in result.
Examples:
"sales are off this quarter"
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Off as an adjective:
Circumstanced (as in well off, better off, poorly off).
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Off as an adjective:
Started on the way.
Examples:
"'off to see the wizard"
"And they're off! Whatsmyname takes an early lead, with Remember The Mane behind by a nose."
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Off as an adjective:
Far; off to the side.
Examples:
"the off horse or ox in a team, in distinction from the nigh or near horse"
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Off as an adjective:
Designating a time when one is not strictly attentive to business or affairs, or is absent from a post, and, hence, a time when affairs are not urgent.
Examples:
"He took an off day for fishing.  an off year in politics; the off season"
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Off as an adjective:
Presently unavailable.
Examples:
"— ''I'll have the chicken please."
"— ''Sorry, chicken's off today."
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Off as an adjective:
Right-hand .
Examples:
"synonyms: near"
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Off as a preposition:
Examples:
"I took it off the table."
"Come off the roof!"
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Off as a preposition (colloquial):
Out of the possession of.
Examples:
"He didn't buy it off him. He stole it off him."
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Off as a preposition:
Away from or not on.
Examples:
"He's off the computer, but he's still on the phone."
"Keep off the grass."
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Off as a preposition:
Disconnected or subtracted from.
Examples:
"We've been off the grid for three days now."
"He took 20% off the list price."
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Off as a preposition:
Distant from.
Examples:
"We're just off the main road."
"The island is 23 miles off the cape."
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Off as a preposition:
No longer wanting or taking.
Examples:
"He's been off his feed since Tuesday."
"He's off his meds again."
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Off as a preposition:
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Examples:
"Tantalum bar 6 off 3/8" Dia × 12"'' — Atom, Great Britain Atomic Energy Authority, 1972"
"samples submitted … 12 off Thermistors type 1K3A531 …'' — BSI test report for shock and vibration testing, 2000"
"I'd like to re-order those printer cartridges, let's say 5-off."
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Off as a verb (transitive, slang):
To kill.
Examples:
"He got in the way so I had him offed."
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Off as a verb (transitive, Singapore, Philippines):
To switch off.
Examples:
"Can you off the light?"
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Off as a noun (rare):
Beginning; starting point.
Examples:
"He has been very obviously an untrustworthy narrator right from the off."