Make loose or looser:
— Loosen the tension on a rope.

synonym: loose.

Make less severe or strict.

synonym: relax.

Roget 47: make loose etc. adj.; loosen, slacken, relax; unglue etc. 46; detach etc. (disjoin) 44.   

Become less severe or strict.

synonym: relax.

Disentangle and raise the fibers of.

synonyms: tease, tease apart.

Cause to become loose:
— Loosen the necktie.

synonyms: undo, untie.

Dutch: ontrafelen, losdoen, loskrijgen, losmaken, losnemen

Make less dense.

Become loose or looser or less tight:
— The noose loosened.

synonyms: loose, relax.

Roget 750: liberate, free; set free, set clear, set at liberty; render free, emancipate, release; enfranchise, affranchise^†; manumit; enlarge; disband, discharge, disenthrall, disenthral, dismiss; let go, let loose, loose, let out, let slip; cast adrift, turn adrift; deliver etc. 672; absolve etc. (acquit) 970.    unfetter etc. 751, untie etc. 43; loose etc. (disjoin) 44; loosen, relax; unbolt, unbar, unclose, uncork, unclog, unhand, unbind, unchain, unharness, unleash; disengage, disentangle; clear, extricate, unloose.    gain one's liberty, obtain one's liberty, acquire one's liberty etc. 748; get rid of, get clear of; deliver oneself from; shake off the yoke, slip the collar; break loose, break prison; tear asunder one's bonds, cast off trammels; escape etc. 671.    ... show more

Dutch: ruim