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:
keep someone up
Meaning / Example:
1. to hold someone upright. > Try to keep him up until I can get his bed made.
2. to prevent someone from going to bed or going to sleep. > I'm sorry, was my trumpet keeping you up?