What does "po box" mean?

A post office box; a lockable box hired from the postal authorities or a private company as a collection point for mail.

What is a synonym for "po box"?

Common synonyms include: call box, letter box, pob, post-office box.

noun

noun ·Rare ·Advanced level

Noun

1
A post office box; a lockable box hired from the postal authorities or a private company as a collection point for mail.
2
Alternative letter-case form of PO box. alt-of
"See also: P.O. Box, Post Office Box"
3
a numbered compartment in a post office where mail is put to be called for wordnet

"See also: P.O. Box, Post Office Box"