Similar word to in-tern:

bar, bind, bound, cage, circumscribe, constrain, cool, cool down, cramp, delimit, detain, enslave, fix, hem in, hinder, hog-tie, hold back, ice, immure, imprison, incarcerate, intern, jail, keep, put a lid on, put away, put on ice, repress, restrain, restrict, send up, s