soften up

soften up idiom
Reduce resistance, as in His sales motto was: a fine lunch and a few drinks often will soften up a prospective customer. This expression transfers lessening of physical hardness to lessening mental resistance. It was first used, however, in World War II, where it meant “reduce the enemy's defenses by preliminary bombing.” [c. 1940]

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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