英语词源字典 - 在线词源网站

sweet-briar (n.)[sweet-briar 词源字典]: "eglantine," 1530s, from sweet (adj.) + briar (n.).[sweet-briar etymology, sweet-briar origin, 英语词源]
sweet-grass (n.): 1570s, from sweet (adj.) + grass (n.). Perhaps so called for the fondness of cattle for it.
sweet-pea (n.): 1732, from sweet (adj.) + pea (n.).
sweet-talk (v.): Sweet-talk, 1935, from noun phrase; see sweet (adj.) + talk (n.). Earliest usages seem to refer to conversation between black and white in segregated U.S.
"I ain' gonna stay heah no longah. Don' nevah keer, ef I do git cotched--or die. Tha's bettah than to stay heah an' listen to Maw Haney sweet-talk the white folks, whilst they drives us clean to the grave. ..." ["The Crisis," July 1935]
Latin had suaviloquens, literally "sweet-spoken."