soft on

1

Attracted to or emotionally involved with, as in He's been soft on Margaret for years. This usage was first recorded in 1840.

2

Not stern, lenient, especially too much so. For example, Some think the court has been soft on violent protesters. This usage was first recorded in 1883.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.