RESTRAINT
bite one's tongue
to struggle not to say something that you really want to say.I had to bite my tongue to keep from telling her what I really thought.I sat through that whole conversation biting my tongue.
bound hand and foot
with hands and feet tied up. (Fixed order.)The robbers left us bound hand and foot.We remained bound hand and foot until the maid found us and untied us.
keep someone or something still and hold someone or something still
to restrain or control someone or something so that the person or thing cannot move.Please keep your foot still. It makes me nervous when you wiggle it.You have to hold the nail still if you want to hit it.
no holds barred
with no restraints. (Slang. From wrestling.)I intend to argue it out with Mary, no holds barred.When Ann negotiates a contract, she goes in with no holds barred and comes out with a good contract.