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:
stick together
Meaning / Example:
1. to adhere to one another. > The noodles are sticking together. What shall I do? > You need to keep the pieces separate while you fry them or else they will stick together.
2. to remain in one another's company. > Let us stick together so we don't get lost. > They stuck together through thick and thin.
A phrase that combines a verb with a preposition or adverb or both and that functions as a verb whose meaning is different from the combined meanings of the individual words.