Idioms

bite the bullet - face a difficult situation and act decisively / do not avoid it

jump the gun - do something too soon, before you should do it

stick to your guns - don’t let other people change your mind/ideas/principles

look daggers at someone - look at them in a very angry or hateful way

put the knife in - deliberately do or say something really hurtful to someone

twist the knife - do or say something which makes a bad/hurtful situation even worse