Stories We Like: Novels For Language Lovers
late 14c., losnen, later lousen (early 15c.), from loose (v.) + -en (1). Related: Loosened; loosening.
To speak more freely; become loquacious; loosen one's tongue: Fatigue and a drink or two loosened him up and he told us the whole story/ Debating Perot is a mistake. They will loose him up (1911+)