词源
Middle English （in the sense 'restrain (a thought or feeling)'）： from Old French refrener, from Latin refrenare, from re- (expressing intensive force) + frenum 'bridle'.
1
- a repeated line or number of lines in a poem or song, typically at the end of each verse（诗歌中, 尤指在节末）叠句; （歌曲中重复演唱, 尤指在末尾）叠歌, 副歌。
1.1
- the musical accompaniment for such a line or number of lines叠歌部分的音乐伴奏。
1.2
- a comment or complaint that is often repeated一再重复的话（或抱怨）：
'Poor Tom' had become the constant refrain of his friends.
“可怜的汤姆”已成了他朋友们的口头禅。
词源
late Middle English: from Old French, from refraindre 'break', based on Latin refringere 'break up' （because the refrain 'broke' the sequence）.