to be cruel and have no sympathy for people.

He wouldn't help his own mother if she needed it - he's got a heart of stone.

• put behind you
• put best foot forward
• put cards on the table
• put down roots
• put down to experience
• put feet up
• put finger on
• put finger on something
• put flesh on
• put flesh on something
• put flesh on the bones of
• put flesh on the bones of something
• put foot down
• put foot in it
• put foot to the floor
• put forth
• put forth something
• put forward
• put forward something
• put hair on chest
• put hair on your chest
• put hairs on chest
• put hairs on your chest
• put hand in pocket
• put hand in your pocket