letter box
1. a numbered compartment in a post office where mail is put to be called for • Syn: Post-Office box, PO Box, POB, call box • Hypernyms: compartment 2. public box for deposit of mail • Syn: postbox, mailbox • Hypernyms: maildrop • Hyponyms: pillar box 3. a private box for delivery of mail • Syn: mailbox • Hypernyms: box
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