Synonyms for Defeat:

n.

smash, disappointment, knock out, loss. Dusting. defeat (noun)
failure, beating, downfall, licking, vote down, frustration, overcome, collapse, vote out.
disappointment (noun)
setback.
event (noun)
licking.
frustration (noun)
disappointment, downfall, foil.
licking (noun)
licking.
ruin (noun)
ruin.

v.

competition (verb)
overcome.
conquer in military manner (verb)
best, surmount, subdue, quell, upset, beat, lick, subjugate, vanquish, obstruct, whip, crush, overthrow, smash, overpower.
frustrate (verb)
cross, squash, baffle, balk, checkmate, overturn, thwart, stump.

Other synonyms:

Dusting, disappointment, Vanquishment, slaughter. hiding, baffle, balk, stymie, thwart. stump, massacre, pullout, upset, whipping. squash, lick, smash, submission, knock out. check. trim, concession. cross. countermove
checkmate.
drub
trounce.
frustration
frustration.
hinder
baffle.
kill
slaughter.
outflank
outplay.
outmaneuver
trump.
prevent
frustrate.
rebuff
repulse.
reversal
comedown.
worst
best.

Usage examples for defeat

  1. Brown did not expect to defeat the South by force of arms. – The Black Experience in America The Immigrant Heritage of America by Norman Coombs
  2. Another week passed, and with it came the news of the British defeat at Ingogo. – Jess by H. Rider Haggard
  3. The only subject on which Richard Arden at all brightened up was the defeat of the favourite. – Checkmate by Joseph Sheridan Le Fanu