to break or fall down suddenly.

Those wooden steps are old, and I'm afraid one of them will give way, so we need to replace them this weekend.

• apple of your eye
• apples and oranges
• a pretty kettle of fish
• a prima donna
• a prime mover
• a priori
• a prophet of doom
• a pub crawl
• a put-up job
• a Pyrrhic victory
• a quantum leap
• a queer fish
• a question mark over something
• a queue-jumper
• a quick fix
• a quick one
• a quick study
• a quid pro quo
• a race against the clock
• a race against time
• a race against time clock
• a rainy day fund
• a rake-off
• a rap across the knuckles
• a rap on the knuckles