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
Phrasal Verb:
lather up
Meaning / Example:
1. [for a horse] to develop a foam of sweat from working very hard. > The horses lathered up heavily during the race.
2. [for soap] to develop thick suds when rubbed in water. > This soap won't lather up, even when I rub it hard.
3. and lather oneself up [for one] to apply soap lather to one's body. > He will spend a few minutes lathering himself up before he rinses. > He lathered up and then shaved.