take a hint
Also, take the hint. Accept an indirect or covert suggestion, as in Evelyn took the hint and quietly left the room. This idiom was first recorded in 1711.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.