Webster's Revised Unabridged Dictionary · 1913

Avaunt

Avaunt (ȧ*vant" or ȧ*vant") , interjection

[French avant forward, from Latin ab + ante before. Compare Avant, Advance.]

Begone; depart; -- a word of contempt or abhorrence, equivalent to the phrase “Get thee gone.”

Avaunt , verb, transitive and intransitive

1.
To advance; to move forward; to elevate. [Obsolete] — Spenser
2.
To depart; to move away. [Obsolete] — Coverdale

Avaunt , verb, transitive and intransitive

[Old French avanter; à (Latin ad) + vanter. See Vaunt.]

To vaunt; to boast. [Obsolete] — Chaucer

Avaunt , noun

A vaunt; to boast. [Obsolete] — Chaucer