formal

to use an opportunity to do something that you want and not to worry about the future.

Seize the day, young man. You may never get the chance to embark on such an adventure again.

• a penny saved is a penny earned.
• a pen pusher
• a pep talk
• a person Friday
• a pick-me-up
• a piece of cake
• a piece of the action
• a piece of the pie
• a pig in a poke
• a pillar of strength
• a pink slip
• a pipe dream
• a piss-artist
• a piss-take
• a piss-up
• a pitched battle
• a pit stop
• a place in the sun
• a plain Jane
• a play on words
• a poacher turned gamekeeper
• a poisoned chalice
• a poison-pen letter
• a political football
• a poor man's