Meaning of the word "be up to your (old) tricks" in English

What does "be up to your (old) tricks" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

be up to your (old) tricks

US /bi ʌp tu jʊər (oʊld) trɪks/
UK /bi ʌp tu jɔː (əʊld) trɪks/
"be up to your (old) tricks" picture

Idiom

to be doing something bad or dishonest, especially something that you have done before

Example:
I saw him sneaking out with a bag of cookies; he must be up to his old tricks again.
The cat has been unusually quiet; I bet she's up to her old tricks, probably trying to get into the pantry.