long suit

long suit idiom
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 © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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