Meaning of “do a disappearing/vanishing act” in the English Dictionary

british dictionary

"do a disappearing/vanishing act" in British English

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do a disappearing/vanishing act

to go away, usually because you do not want to do something or meet someone:

Tina always does a vanishing act when my mother comes to stay.

(Definition of “do a disappearing/vanishing act” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)