What word or phrase does your mother always say?
1540s, "held in repute," past participle adjective from repute (v.). Meaning "supposed to be" is from 1570s. Related: Reputedly.
late 14c., from Middle French reputer (late 13c.) or directly from Latin reputare "to count over, reckon; think over" (see reputation). Related: Reputed; reputing.
1550s, from repute (v.).