intransitive verb
1. : to become more liberal or generous with money
loosen up, and be a big, kindly, generous human being — Motor Print
2. : to become less tense or reserved : relax
wanted them to loosen up and have a good time — Jean Boley
the way you loosen up and forget you're a highbrow — Sinclair Lewis
transitive verb
: to introduce more freedom or flexibility into
the private business policies which are helping to loosen up the economy — S.H.Slichter