mind (your) p's and q's

to pay close attention to small details.

There had been two recent security problems in the company and everyone should mind their p's and q's.

• the whys and wherefores of something
• the witching hour
• the woman in the street
• the woman of dreams
• the woman of your dreams
• the woman on the Clapham omnibus
• the woman on the street
• the wooden spoon
• the works
• the world and his wife
• the world is oyster
• the world is your oyster
• the worm has turned.
• the worse for wear
• the worst-case scenario
• the worst of both worlds
• the writing is on the wall
• the writing on the wall
• the wrong side of the tracks
• They broke the mould when they made someone.
• They broke the mould when they made something.
• They can whistle for it!
• thick skin
• thick-skinned
• thin end of the wedge