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English definition of “rock”

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rock

noun uk   /rɒk/ us    /rɑːk/

rock noun (STONE)

B1 [C or U] the dry solid part of the Earth's surface, or any large piece of this that sticks up out of the ground or the sea: Mountains and cliffs are formed from rock. The boat struck a rock outside the bay and sank. [C] a piece of rock or stone: The demonstrators were hurling rocks at the police.rocks [plural] a line of large stones sticking up from the sea: The storm forced the ship onto the rocks. [C] slang for a valuable stone used in jewellery, especially a diamond : Have you seen the size of the rock he gave her for their anniversary?
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rock noun (MUSIC)

A2 [U] a type of popular music with a strong, loud beat that is usually played with electric guitars and drums: a rock group a rock star
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rock

verb uk   /rɒk/ us    /rɑːk/

rock verb (MOVE)

C2 [I or T] to (cause someone or something to) move backwards and forwards or from side to side in a regular way: He picked up the baby and gently rocked her to sleep. If you rock back on that chair, you're going to break it. [T] If a person or place is rocked by something such as an explosion, the force of it makes the person or place shake: The explosion, which rocked the city, killed 300.
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rock verb (SHOCK)

[T] If an event rocks a group of people or society, it causes feelings of shock: The managing director's resignation rocked the whole company.

rock verb (WEAR SUCCESSFULLY)

[T] slang 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.
Phrasal verbs
(Definition of rock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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