also school-marm, "female school teacher," 1834, American English colloquial, in countrified humor writing of "Major Jack Downing" of Maine (Seba Smith); variant of school-ma'am (1828), American English, from school (n.1) + ma'am. See R. Used figuratively from 1887 in reference to patronizing and priggish instruction.[schoolmarm etymology, schoolmarm origin, 英语词源]