in. to catch on with someone; to intrigue someone; to become popular with someone. : Sam and Mary are getting along fine. I knew they'd click.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
click
1581, of imitative origin; the figurative sense of "fit together" first recorded 1915.
Main Entry: click Pronunciation: 'klik Function: noun : a short sharp sound heard in auscultation and associated with various abnormalities of the heart