Webster's Revised Unabridged Dictionary · 1913

Spat

Spat , imperfect

imperfect of Spit. [Obsolete or Rare]

Spat , noun

[From the root of spit; hence, literally, that which is ejected.]

A young oyster or other bivalve mollusk, both before and after it first becomes adherent, or such young, collectively.

Spat , verb, intransitive and transitive

To emit spawn; to emit, as spawn.

Spat , noun

[Compare Pat.]

1.
A light blow with something flat. [United States & Provincial English]
2.
Hence, a petty combat, esp. a verbal one; a little quarrel, dispute, or dissension. [United States]

Spat , intransitive verb

To dispute. [Rare] — Smart

Spat , transitive verb

To slap, as with the open hand; to clap together; as the hands. [Local, United States]
Little Isabel leaped up and down, spatting her hands. — Judd

Spat , noun

[Short for Spatterdash.]

1.
A legging; a gaiter. [Scottish & Dialectal English]
2.
A kind of short cloth or leather gaiter worn over the upper part of the shoe and fastened beneath the instep; -- chiefly in pl.