Rocking
来自Big Physics
late Old English roccian, probably from a Germanic base meaning ‘remove, move’; related to Dutch rukken ‘jerk, tug’ and German rücken ‘move’. The noun dates from the early 19th century.
wiktionary
rock + -ing
etymonline
rocking (adj.)
"moving back and forth or to and fro," late 14c., rokking, present-participle adjective from rock (v.1). Of music, from 1949 (see rock (v.2)). Rocking-horse "wooden horse mounted on rockers for children" is recorded from 1724; rocking-chair "chair mounted on rockers" is from 1766.
