n.
Function: intransitive verb
Date: before 12th century
1 a : to produce or form foam b : to froth at the mouth especially in anger broadly : to be angry
2 : to gush out in foam
3 : to become covered with or as if with foam <streets ⋯ foam ing with life ― Thomas Wolfe>
transitive verb
1 : to cause to foam specifically : to cause air bubbles to form in
2 : to convert (as a plastic) into a foam
– foam · able \ ' f ō -m ə -b ə l \ adjective
– foam · er \ f ō -m ə r \ noun