"to reject with scorn," 1710, earlier "to mock" (c. 1600), of Scandinavian origin (compare Old Norse skuta, skute "to taunt"), probably from a source related to shout (v.). Related: Scouted; scouting; scoutingly.
"person who scouts, one sent out to gain information," 1550s, from scout (v.1). Boy Scout is from 1908. Scout's honor attested from 1908.