up to your tricks

up to your tricks

or

up to your old tricks

COMMON If someone is up to their tricks or up to their old tricks, they are behaving in the same dishonest or foolish way that they have done in the past. Homeowners wondering if estate agents are no longer up to their tricks should think again. They seemed to be up to their old tricks of promising one thing and doing the opposite.
See also: trick, up

up to your (old) tricks

misbehaving in a characteristic way. informal
See also: trick, up