- 1[transitive] crest something (formal) to reach the top of a hill, mountain, or wave He slowed the pace as they crested the ridge. The ship crested a wave and then fell twenty feet or more.
- 2 [intransitive] (of a flood, wave, etc.) to reach its highest level before it falls again (figurative) The level of debt crested at a massive $920 billion in 2009.
NAmE//krɛst//Verb Forms present simple I / you / we / they crest
he / she / it crests
past simple crested
-ing form cresting