1 (often refl., usu. foll. by from) check or hold in; keep in check or under control or within bounds.
2 repress; keep down.
3 confine; imprison.
Derivatives:
restrainable adj. restrainer n.
Etymology: ME f. OF restrei(g)n- stem of restreindre f. L restringere restrict- (as RE-, stringere tie)
Useful english dictionary. 2012.