sloganyoudaoicibaDictYouDict
slogan: [16] Slogan is a Gaelic contribution to English. It comes from sluaghghairm ‘war-cry’, a compound formed from sluagh ‘army’ and ghairm ‘shout’. English at first used it in its original Gaelic sense, and the metaphorical ‘catchphrase’ did not emerge until the 18th century.
slogan (n.)youdaoicibaDictYouDict
1670s, earlier slogorne (1510s), "battle cry," from Gaelic sluagh-ghairm "battle cry used by Scottish Highland or Irish clans," from sluagh "army, host, slew," from Celtic and Balto-Slavic *slough- "help, service." Second element is gairm "a cry" (see garrulous). Metaphoric sense of "distinctive word or phrase used by a political or other group" is first attested 1704.