Phrasal verbs are multi-word verbs that, like single-word verbs, convey action of the body or mind or occurrences. Phrasal verbs consist of a basic verb + another word or words, usually a preposition or adverb. Example: speak (basic verb) + up (preposition)
Phrasal Verb:
leak out [for information]
Meaning:
to become known unofficially.
Example:
I hope that news of the new building does not leak out before the contract is signed.