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courseyoudaoicibaDictYouDict[course 词源字典]
course: [13] Etymologically, course denotes ‘running’. It comes via Old French cours from Latin cursus, a derivative of the verb currere ‘run’ (from which English gets current and a wide range of other words, from courier to occur). Its earliest meaning in English was ‘onward movement in a particular direction’, but over the centuries it has developed a network of additional senses.

From the same Latin base curs- are concourse [14], cursory [17] (from Latin cursōrius), discourse [14] (and the related discursive [16]), excursion [16], incursion [15], precursor [16], and recourse [14]. The derived noun courser [13] is a doublet of corsair.

=> corsair, courier, current, discourse, excursion, occur[course etymology, course origin, 英语词源]
course (n.)youdaoicibaDictYouDict
late 13c., "onward movement," from Old French cors (12c.) "course; run, running; flow of a river," from Latin cursus "a running race or course," from curs- past participle stem of currere "to run" (see current (adj.)).

Most extended senses (meals, etc.) are present in 14c. Academic meaning "planned series of study" is c. 1600 (in French from 14c.). Phrase of course is attested from 1540s; literally "of the ordinary course;" earlier in same sense was bi cours (c. 1300).
course (v.)youdaoicibaDictYouDict
16c., from course (n.). Related: Coursed; coursing.