Meaning of “try it on” in the English Dictionary

british dictionary

"try it on" in British English

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try it on

UK informal

to deceive someone or behave badly, especially in order to discover how much of your bad behaviour will be allowed:

He's not really ill - he's just trying it on.
The kids often try it on with a new babysitter.

(Definition of “try it on” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)