leisure (n.)youdaoicibaDictYouDict[leisure 词源字典]
early 14c., leisir, "opportunity to do something" (as in phrase at (one's) leisure), also "time at one's disposal," from Old French leisir (Modern French loisir) "capacity; permission; leisure, spare time; free will; idleness, inactivity," noun use of infinitive leisir "be permitted," from Latin licere "be permitted" (see licence). The -u- appeared 16c., probably on analogy of words like pleasure. Phrase leisured class attested by 1836.[leisure etymology, leisure origin, 英语词源]
school (n.1)youdaoicibaDictYouDict
"place of instruction," Old English scol, from Latin schola "intermission of work, leisure for learning; learned conversation, debate; lecture; meeting place for teachers and students, place of instruction; disciples of a teacher, body of followers, sect," from Greek skhole "spare time, leisure, rest ease; idleness; that in which leisure is employed; learned discussion;" also "a place for lectures, school;" originally "a holding back, a keeping clear," from skhein "to get" (from PIE root *segh- "to hold, hold in one's power, to have;" see scheme (n.)) + -ole by analogy with bole "a throw," stole "outfit," etc.

The original notion is "leisure," which passed to "otiose discussion" (in Athens or Rome the favorite or proper use for free time), then "place for such discussion." The Latin word was widely borrowed (Old French escole, French école, Spanish escuela, Italian scuola, Old High German scuola, German Schule, Swedish skola, Gaelic sgiol, Welsh ysgol, Russian shkola). Translated in Old English as larhus, literally "lore house," but this seems to have been a glossary word only.

Meaning "students attending a school" in English is attested from c. 1300; sense of "school building" is first recorded 1590s. Sense of "people united by a general similarity of principles and methods" is from 1610s; hence school of thought (1864). School of hard knocks "rough experience in life" is recorded from 1912 (in George Ade); to tell tales out of school "betray damaging secrets" is from 1540s. School bus is from 1908. School days is from 1590s. School board from 1870.