up to one's old tricks(redirected from up to old tricks)
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up to (one's) (old) tricks
Doing things that one was known for doing in the past, especially deceitful or mischievous behavior. Food went missing from the school cafeteria? It sounds like Billy is up to his tricks again. I reunited with my two best friends after nearly five years apart, and we were up to our old tricks again in no time.
up to one's old tricks
Behaving in one's usual deceitful or mischievous fashion, as in She's up to her old tricks, telling her parents one thing and her teachers another, or He's up to his old tricks, teasing his sisters until they're in tears. Put as at his old tricks, this idiom was first recorded in 1823.