mark (one's) card

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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. © 2015 Farlex, Inc, all rights reserved.

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 © Farlex 2017
See also:
References in classic literature ?
We couldn't mark cards, deal from the bottom, an' ring in cold decks like the others.
enters Everyone who enters a jar gets their preserve tasted and judged and sent a personalised mark card with feedback on how the marmalade can be improved - or, if they are lucky, a gold, silver or bronze award.
South's Alex Motsch and Ian Strgar beat North Medford's Mark Card and Alex Huynh, 6-0, 6-0, in the quarterfinals, and the Axemen's Ryan Kingzett and Eli Zauner beat South Medford's Travis Pratt and Dylan Reese, 6-0, 6-0, to reach the semis.
The 36-year-old then punched fellow drinker Mark Cards in the face, before grabbing his neck and biting his nose, a court heard.
At times like this there are always some who like to mark cards and having been taken aside by one of the blazers it was even suggested some imaginary feud between myself and SFA chief executive Gordon Smith meant that his man, Burley, would never win credit in these pages.
Their nine-hole course now has an official standard scratch score for ladies which makes it ideal for beginners of any age to mark cards for handicap purposes.
Other players mark cards by tearing or nicking them with a fingernail, usually too obvious a tactic, although a "punched" card is much more difficult to see.
The Premier Security Card supply line includes embedded hologram cards, opacity mark cards, color-shifting ink cards, protective laminates, and hand-applied peel-and-stick laminates.
Specimens, reqs, and optical mark cards (we use the term "card" interchangeably with "form") are prepared by our satellite collection centers and brought to our central location by courier.