harden (your) heart

slightly formal

to make yourself stop feeling kind or friendly towards someone.

You've just got to harden your heart and tell him to leave.

• get the short end of the stick
• get the thumbs down
• get the thumbs up
• get the upper hand
• get the wind up
• get the wind up someone
• get the wrong end of the stick
• get through
• get through to
• get through to someone
• getting on
• getting on in years
• getting on toward
• getting there is half the fun
• get to first base
• get to grips with
• get to grips with something
• get tongue around
• get tongue around something
• get tongue round
• get tongue round something
• get to the bottom of
• get to the bottom of something
• get under feet
• get under skin