Antonyms of oppose:
bow, capitulate, give in, knuckle under, stoop, submit, succumb, surrender, yield, abide, bear, endure, suffer, advocate, back, champion, endorse, support, uphold, advance, cultivate, encourage, forward, foster, further, nourish, nurture, promote.
Examples of usage:
  1. He should have beaten him, the dog, the coward, to oppose a woman's will by force!"
    "The New Tenant", E. Phillips Oppenheim.
  2. But a moment's reflection convinced him that the attempt at escape would be futile, the men outside being doubtless prepared to oppose his exit.
    "The White Squaw", Mayne Reid.
  3. Should they come suddenly, remember that it is of no use to try to oppose their passage down the river.
    "Beric the Briton A Story of the Roman Invasion", G. A. Henty.