old-fashioned

if two people are thick as thieves, they are close friends.

I'm sure she tells Ruth what's going on - they're as thick as thieves, those two.

• hit the panic button
• hit the right note
• hit the road
• hit the roof
• hit the sack
• hit the skids
• hit the something mark
• hit the spot
• hit the wall
• hit up
• hit where it hurts
• hit where it hurts most
• hit you between the eyes
• hit you like a ton of bricks
• hit you right between the eyes
• hit your stride
• Hobson's choice
• ho-hum
• hoist a few
• hoist with own petard
• hoist with your own petard
• hold against
• hold against someone
• hold a gun to head
• hold a gun to someone's head