Same word as keep in:

arrest, avert, bar, bit, bridle, check, constrain, cramp, curb, discourage, enjoin, faze, forbid, frustrate, hang up, hinder, hog-tie, hold back, hold down, hold in, impede, interdict, keep in, obstruct, outlaw, prohibit, put on brakes, repress, restrain, sandbag, stop, stym