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3. be not on

be not on

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be not on

if you say that behaving in a particular way is not on, you mean that it is not right and people should not do it I've told her that bringing crowds of friends home every evening isn't on. It's not on to expect other people to clear up your mess.

See It's's not cricket!, Not half!, Not on your life!, Not on your nelly!, About time too!

See also: not, on