The difference between Must and No-no
When used as nouns, must means something that is mandatory or required, whereas no-no means something that is forbidden, prohibited, discouraged or taboo.
Must is also verb with the meaning: to do with certainty.
check bellow for the other definitions of Must and No-no
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Must as a verb (modal, _, auxiliary, defective):
To do with certainty; .
Examples:
"If it has rained all day, it must be very wet outside."
"You picked one of two, and it wasn't the first: it must have been the second."
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Must as a verb (modal, _, auxiliary, defective):
To do as a requirement; .
Examples:
"You must arrive in class on time.'' — the requirement is an imperative"
"This door handle must be rotated fully.'' — the requirement is a directive"
"Arise, and go into the city, and it shall be told thee what thou must do.'' (Bible, Acts 9:6)"
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Must as a verb (modal, _, auxiliary, defective):
said about something that is very likely, probable, or certain to be true
Examples:
"The children must be asleep by now."
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Must as a noun:
Something that is mandatory or required.
Examples:
"If you'll be out all day, a map is a must."
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Must as a noun:
The property of being stale or musty.
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Must as a noun:
Something that exhibits the property of being stale or musty.
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Must as a noun:
Fruit juice that will ferment or has fermented, usually grapes.
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Must as a verb (transitive):
To make musty.
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Must as a verb (intransitive):
To become musty.
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Must as a noun:
A time during which male elephants exhibit increased levels of sexual activity and aggressiveness .
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Must as a noun:
An elephant in this sexual and aggressive state.
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No-no as a noun (colloquial, often, childish):
Something that is forbidden, prohibited, discouraged or taboo.
Examples:
"Smoking indoors is becoming a real no-no these days, in many places."
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No-no as a noun (baseball, colloquial):
A no-hitter; a game in which no batter on one of the teams got a hit.
Examples:
"He threw two no-nos in his career."