What does "letterbox" mean?

A box into which mail is put.; A collection point for mail intended for onward delivery, a secure box or receptacle for this purpose.

What is a synonym for "letterbox"?

Common synonyms include: deed, letter box, mail slot, mail slot, mailbox, mailbox.

adj, noun, verb

adj, noun, verb ·Uncommon ·Advanced level

Noun

1
A box into which mail is put.; A collection point for mail intended for onward delivery, a secure box or receptacle for this purpose. Commonwealth, Ireland, UK
2
A box into which mail is put.; A delivery point for mail, a box, compartment or slot for this purpose. Commonwealth, Ireland, UK
"A wad of junk mail was pushed through the letterbox in the front door and dropped onto the mat."
3
A hidden container that holds a logbook and rubber stamp, found by following clues as a form of recreation.
4
A rectangular hole or slot.
"His strength was running out fast: one more good letterbox was all that he could conceive himself able to make. He made it, hacking away with slow, painful strokes, his axe-handle slippery with his sweat."

Verb

1
To transfer a widescreen motion picture to home video formats while preserving the original aspect ratio, with the placing of black bars above and below the picture area. transitive
2
To hunt for letterboxes (containers with logbook and rubber stamp) by following clues. intransitive, transitive