soft spot

soft spot idiom
  1. A weak or vulnerable point, as in That's the soft spot in his argument. [Mid-1900s]
  2. have a soft spot for. Have a tender or sentimental feeling for, as in Grandpa had a soft spot for Brian, his first grandson. This expression, first recorded in 1753 as “a soft place in one's heart,” uses soft in the sense of “tender.”

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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