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Wiktionary
get wise

vb. 1 (context intransitive slang often with "to" or with "with" English) To be impertinent. 2 (context intransitive slang often with "to" English) To see through deceit.

WordNet
get wise

v. understand, usually after some initial difficulty; "She didn't know what her classmates were plotting but finally caught on" [syn: catch on, get onto, tumble, latch on, cotton on, twig, get it]

Usage examples of "get wise".

They want to be there so in case these foxy outlaws get wise before they're down on the ground or inside the bank.

I do mean that he had better not try to run things with the high hand with which he bossed his own business or the public will throw him out on his ear once they get wise to him.

The instant they get wise and open fire, give me a full head of steam.