dog tag

1. 1.

   military identification tag worn on a chain around the neck

   Broadertag
2. 2.

   metal plate on a dog collar bearing its registration number

   Broadertag

Questions about dog tag

What does dog tag mean?

dog tag means "military identification tag worn on a chain around the neck". That is the primary sense; the word has 2 in total, listed in full on this page.

Is dog tag a common word?

dog tag is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.