0 past simple and past participle of rock
1 to (cause someone or something to) move backwards and forwards or from side to side in a regular way:
2 If an event rocks a group of people or society, it causes feelings of shock:
The managing director's resignation rocked the whole company.
3 to wear a particular style of clothing, etc. and look good or fashionable:
There are celebrities over 40 years old who can still rock a tattoo.
He rocked the cradle with a gentle backwards and forwards motion.
He tried to calm the screaming baby by rocking it back and forth.
She was gazing out the window, rocking rhythmically to and fro.
He rocks in his sleep.
Neither nationalism nor social unrest rocked the provisional republic.
Vials were rocked gently during the invasion assay.
A rocker is a chair that can be rocked back and forth.