v. 25B6; verb
you simply loosen two screws : MAKE SLACK, slacken, unstick; unfasten, detach, release, disconnect, undo, unclasp, unlatch, unbolt.
her fingers loosened : BECOME SLACK, slacken, become loose, let go, ease; work loose, work free.
Philip loosened his grip : WEAKEN, relax, slacken, loose, lessen, reduce, moderate, diminish.
you need to loosen up : RELAX, unwind, ease up/off; informal let up, hang loose, lighten up, go easy.
tighten.