loose as a goose

Completely relaxed. This phrase, probably aided in longevity by the rhyme, dates from the first half of the 1900s. In earlier usage it sometimes denoted promiscuity (loose morals), diarrhea (loose bowels), and so on, but since about 1950 it has mostly stuck to its present meaning. The Los Angeles Times (April 7, 1979) had it in this sense: “Philadelphia Phillies’ manager Danny Ozark is loose as a goose despite intense pressure to win.”