mark (one's) card

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mark (one's) card

To give someone pertinent information about something or someone else; to tip someone off. Shortly after I started, one of my co-workers marked my card about the boss's tendency to give very harsh criticism.
See also: card, mark

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