| Idiom | Meaning | Example | 
| peek-a-boo | 
peek through the fingers with hands covering eyes
 | 
Shelly was playing peek-a-boo with the baby.
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| peep this | 
look at this, check this out, eyeball this
 | 
Peep this! My fingernails are as long as Dolly's!
 | 
| peer sneer | 
an unfriendly look from a person who is the same age
 | 
When the manager praised my work, Vic gave me a peer sneer.
 | 
| pell-mell | 
in a wild manner, in panic, harum-scarum
 | 
When the fire alarm sounded  we ran pell-mell down the hall.
 | 
| pen those words/lines | 
write those words or lines, compose that line
 | 
The medium is the message: Do you know who penned that line?
 | 
| penny for your thoughts | 
(See a penny for your thoughts)
 | 
 | 
| penny pincher | 
a person who spends carefully, a thrifty person
 | 
He used to be a penny pincher, but now he spends freely.
 | 
| penny wise, dollar dumb | 
wise in saving, foolish in spending; burn a hole in your pocket
 | 
You spent our carefully-saved money on an expensive electric organ
that neither of us can play! Now that is penny wise, dollar dumb!
 | 
| penny wise, pound foolish | 
careful with pennies but careless with pounds, penny wise, dollar dumb
 | 
Our budget is penny wise and pound foolish - we save a little on food,
and waste a lot on a luxury car! 
 | 
| people who live in glass houses shouldn't throw stones | 
people who have faults should not criticize others
 | 
Perfect people can be critical, but people who live in glass houses shouldn't throw stones.
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