long suit

noun
1.
Cards.
a.
the suit in which the most cards are held in a hand.
b.
(in bridge) a suit in which four or more cards are held in a hand.
2.
the quality, activity, endeavor, etc., in which one excels: Diligence is his long suit.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
long suit
 
n
1.  a.  the longest suit in a hand of cards
 b.  a holding of four or more cards of a suit
2.  informal an outstanding advantage, personal quality, or talent

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Idioms & Phrases

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]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Truth is not their long suit either and deafness to reason is endemic.
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