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Use "spare time" in a sentence
"She sang Yiddish songs and Rudy Vallée songs, played the ukulele and the mandolin, and entertained at bar mitzvahs in her spare time before she became an old woman whose friends died before she did."
"Dave is currently the househusband, but in his spare time he plays guitar and writes songs."
"Up to the age of eighteen he worked as a clerk in a drapery establishment in Paris, but made use of all his spare time in studying, until he was received at the Ecole Polytechnique in 1830."