n. 25B6; noun there is no rein on his behaviour : RESTRAINT, check, curb, constraint, restriction, limitation, control, brake.
25B6; verb they reined back costs : RESTRAIN, check, curb, constrain, hold back/in, keep under control, regulate, restrict, control, curtail, limit.
25A0; free rein FREEDOM, a free hand, leeway, latitude, flexibility, liberty, independence, free play, licence, room to manoeuvre, carte blanche.
25A0; keep a tight rein on EXERCISE STRICT CONTROL OVER, regulate, discipline, regiment, keep in line.