Etymology
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loosen (v.)

late 14c., losnen (transitive) "make loose, free from tightness," later lousen (early 15c.), from loose (v.) + -en (1). Intransitive sense of "become loose" is from 1670s. Meaning "limber the muscles before physical effort" is from 1955. Related: Loosened; loosening; loosener.

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Definitions of loosen

loosen (v.)
make loose or looser;
loosen the tension on a rope
Synonyms: loose
loosen (v.)
make less severe or strict;
Synonyms: relax
loosen (v.)
become less severe or strict;
Synonyms: relax
loosen (v.)
disentangle and raise the fibers of;
Synonyms: tease / tease apart
loosen (v.)
cause to become loose;
loosen the necktie
Synonyms: untie / undo
loosen (v.)
make less dense;
loosen the soil
loosen (v.)
become loose or looser or less tight;
The noose loosened
Synonyms: relax / loose
From wordnet.princeton.edu