get wise
get wise {v. phr.}, {slang}
To learn about something kept secret from you; become alert.
One girl pretended to be sick on gym days when she had athletics, until the teacher got wise and made her go anyway.
- Often used with "to".
The boys got wise to Jack's fondness for bubble gum.
If you don't get wise to yourself and start studying, you will fail the course.
Contrast: IN THE DARK.
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Source: A Dictionary of American Idioms
