D defs.my
Entry 3 senses Webster, 1913

Sub

· IPA /sʌb/
01 n. A subordinate; a subaltern.
  1. 1.
    A subordinate; a subaltern.[Colloq.]
  2. 2.
    a shortened form of submarine, the boat. See: submarine
  3. 3.
    a shortened form of submarine sandwich; also called hero, hero sandwich, and grinder. Also: hero, hero sandwich, grinder See: submarine sandwich