Wiktionary
vb. (context transitive English) To lather; to cover with suds
Usage examples of "lather up".
Taking the soap once more in hand, she preceded to lather up his chest, making wide, circular sweeping motions.
Then too, ol' Carey Carr, he ain't worried 'bout no shampoo, 'cause he's losing his hair fast, but he does want some kind of shaving soap that'll lather up stiff and thick, and I'll work on that one, too, whenever I got the time or can make time.
I get wet, wait for the water to kick off, and lather up with a handful of gritty soap.
Then too, ol' Carey Carr, he ain't worried 'bout no shampoo, 'cause he's losing his hair fast, but he does want some kind of shaving soap that'll lather up stiff and thick, and I'll work on that one, too, whenever J got the time or can make time.
The water blasts you with heavy, steady pressure while you lather up.
If you don't like cool water, you just get wet and turn the water off, and lather up, and then turn it on to rinse off.