The difference between Drain and Flood
When used as nouns, drain means a conduit allowing liquid to flow out of an otherwise contained volume, whereas flood means a (usually disastrous) overflow of water from a lake or other body of water due to excessive rainfall or other input of water.
When used as verbs, drain means to lose liquid, whereas flood means to overflow, as by water from excessive rainfall.
check bellow for the other definitions of Drain and Flood
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Drain as a noun (chiefly, US, Canada):
A conduit allowing liquid to flow out of an otherwise contained volume; a plughole
Examples:
"The drain in the kitchen sink is clogged."
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Drain as a noun (chiefly, UK):
An access point or conduit for rainwater that drains directly downstream in a (drainage) basin without going through sewers or water treatment in order to prevent or belay floods.
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Drain as a noun:
Something consuming resources and providing nothing in return.
Examples:
"That rental property is a drain on our finances."
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Drain as a noun (vulgar):
An act of urination.
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Drain as a noun (electronics):
One terminal of a field effect transistor (FET).
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Drain as a noun (pinball):
An outhole.
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Drain as a noun (slang, dated):
A drink.
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Drain as a verb (intransitive):
To lose liquid.
Examples:
"The clogged sink drained slowly."
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Drain as a verb (intransitive):
To flow gradually.
Examples:
"The water of low ground drains off."
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Drain as a verb (transitive, ergative):
To cause liquid to flow out of.
Examples:
"Please drain the sink. It's full of dirty water."
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Drain as a verb (transitive, ergative):
To convert a perennially wet place into a dry one.
Examples:
"They had to drain the swampy land before the parking lot could be built."
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Drain as a verb (transitive):
To deplete of energy or resources.
Examples:
"The stress of this job is really draining me."
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Drain as a verb (transitive):
To draw off by degrees; to cause to flow gradually out or off; hence, to exhaust.
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Drain as a verb (transitive, obsolete):
To filter.
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Drain as a verb (intransitive, pinball):
To fall off the bottom of the playfield.
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Flood as a noun:
A (usually disastrous) overflow of water from a lake or other body of water due to excessive rainfall or other input of water.
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Flood as a noun (figuratively):
A large number or quantity of anything appearing more rapidly than can easily be dealt with.
Examples:
"a flood of complaints"
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Flood as a noun:
The flowing in of the tide, opposed to the ebb.
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Flood as a noun:
A floodlight.
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Flood as a noun:
Menstrual discharge; menses.
Examples:
"rfquotek Harvey"
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Flood as a noun (obsolete):
Water as opposed to land.
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Flood as a verb:
To overflow, as by water from excessive rainfall.
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Flood as a verb:
To cover or partly fill as if by a flood.
Examples:
"The floor was flooded with beer."
"They flooded the room with sewage."
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Flood as a verb (figuratively):
To provide (someone or something) with a larger number or quantity of something than can easily be dealt with.
Examples:
"The station's switchboard was flooded with listeners making complaints."
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Flood as a verb (Internet, ambitransitive):
To paste numerous lines of text to (a chat system) in order to disrupt the conversation.
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Flood as a verb:
To bleed profusely, as after childbirth.