- rocking (adj.)
[rocking 词源字典]
- "moving back and forth or to and fro," late 14c., present participle adjective from rock (v.1). Of music, from 1949 (see rock (v.2)). Rocking-horse is first recorded 1724; rocking-chair is from 1766.[rocking etymology, rocking origin, 英语词源]