long suit, one's

long suit

A subject, activity, or field, at which someone is particularly skilled or adept. Working with computers was never my long suit, so this receptionist position is going to be a real challenge for me. Movie trivia is one of Sam's long suits, so I think we should ask her to be on our pub quiz team.
See also: long, suit
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

long suit

One's strong point or advantage, as in Organizing has never been Nancy's long suit. This expression alludes to whist, bridge, and other card games in which holding numerous cards in a single suit may convey a strong advantage. [c. 1900]
See also: long, suit
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

long suit, one's

One’s particular strength or advantage. This term comes from whist and related card games, including present-day contract bridge, in which holding a hand with numerous cards in a single suit may convey a strong advantage, particularly if that suit is the trump suit. The term began to be transferred to other enterprises about 1900.
See also: long
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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