mark someone's card

mark (one's) card

To alert one to pertinent information about something or someone; to tip one off. Shortly after I started, one of my coworkers marked my card about the boss's tendency to give very harsh criticism.
See also: card, mark
Farlex Dictionary of Idioms.

mark someone's card

give someone information. informal
This idiom, which dates from the mid 20th century, derives from the world of horse racing. The card is a race card , the list of runners at a race meeting, so to mark someone's card is to give them tips for possible winners.
See also: card, mark
Farlex Partner Idioms Dictionary
See also:
  • (one) could use (something)
  • drive (one) out of office
  • force (one) out of office
  • force out of office
  • give (one) (one's) head
  • give head
  • give somebody their head
  • give someone their head
  • cooking for one
  • 1FTR