Cut off the testicles (of male animals such as horses):
— The vet gelded the young horse.

synonym: cut.

Roget 38: subduct, subtract; deduct, deduce; bate, retrench; remove, withdraw, take from, take away; detract.    garble, mutilate, amputate, detruncate^†; cut off, cut away, cut out; abscind^†, excise; pare, thin, prune, decimate; abrade, scrape, file; geld, castrate; eliminate.    diminish etc. 36; curtail etc. (shorten) 201; deprive of etc. (take) 789; weaken.    ... show more

Roget 158: be impotent etc. adj.; not have a leg to stand on.    vouloir rompre l'anguille au genou [Fr.], vouloir prendre la lune avec les dents [Fr.].    collapse, faint, swoon, fall into a swoon, drop; go by the board, go by the wayside; go up in smoke, end in smoke etc. (fail) 732.    render powerless etc. adj.; deprive of power; disable, disenable^†; disarm, incapacitate, disqualify, unfit, invalidate, deaden, cramp, tie the hands; double up, prostrate, paralyze, muzzle, cripple, becripple^†, maim, lame, hamstring, draw the teeth of; throttle, strangle, garrotte, garrote; ratten^†, silence, sprain, clip the wings of, put hors de combat [Fr.], spike the guns; take the wind out of one's sails, scotch the snake, put a spoke in one's wheel; break the neck, break the back; unhinge, unfit; put out of gear.    unman, unnerve, enervate; emasculate, castrate, geld, alter, neuter, sterilize, fix.    shatter, exhaust, weaken etc. 160.    ... show more

Dutch: castreren, ontmannen, snijden