| Idiom | Meaning | Example | 
| pig | 
police,  cop, flatfoot, fuzz
 | 
Rocky says, "There was pigs on every corner. We couldn't move."
 | 
| pig in a poke | 
(See a pig in a poke)
 | 
 | 
| pig out | 
eat a lot, fill your face
 | 
Then we went to the Dairy Queen and pigged out on soft ice cream.
 | 
| piggy bank | 
glass or porcelain pig used for saving coins
 | 
The little girl was counting the money in her piggy bank.
 | 
| piggyback | 
carried on someone's back, riding on someone's back
 | 
Jurgen loved to ride piggyback when his dad walked in the park.
 | 
| piggyback | 
succeed on the efforts of others
 | 
A catering firm piggybacked to success on United Airlines.
 | 
| pill | 
(See the pill)
 | 
 | 
| pilot project | 
the model or prototype, trial run
 | 
This solar generator is our pilot project. If it's successful we'll
learn from it and build more.
 | 
| pimple pole | 
youth with pimples, teenager with zits
 | 
Hey, pimple pole! You left your locker door open.
 | 
| pin down/pin him down | 
get a direct answer, obtain the facts
 | 
Jed won't answer my questions. He's difficult to pin down.
 |