leave (someone) to (someone's) tender mercies

humorous

to let someone be dealt with by another person who is not likely to show them any kindness or sympathy.

Should I have a word with her myself or leave her to Mick's tender mercies?

• play possum
• play Russian roulette
• play safe
• play second fiddle
• play second fiddle to
• play second fiddle to someone
• play second fiddle to something
• play silly buggers
• play someone at own game
• play someone at their own game
• play someone for a fool
• play someone for a sucker
• play something by ear
• play the field
• play the fool
• play the game
• play the goat
• play the market
• play the waiting game
• play to the gallery
• play up
• play up something
• play up to
• play up to someone
• play up to something