Phrasal verbs, also called two-word verbs, are idiomatic expressions wherein the second element of the verb (the adverb or particle) is not necessarily predictable.
Phrasal Verb:
slip by
Meaning / Example:
1. and slip by someone or something to move by someone or something quickly or unnoticed; to move through a tight area or past someone or something in a tight area. > The hall was narrow, and I could hardly have slipped by.
2. [for time] to pass quickly or unnoticed. > Goodness, almost an hour has slipped by! How time flies.
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)