1
general::
Phrase(s): boil over (with something)
Fig. [for someone] to erupt in great anger. • The boss boiled over with anger. • Things got out of hand and the crowd’s passions boiled over., Phrase(s): boil over
[for a liquid] to overflow while being boiled. (See also boil over (with something).) • The sauce boiled over and dripped onto the stove. • Don’t let the stew boil over!
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Erupt in anger, excitement, or other strong emotion. For example, The mere mention of a tax increase will make Kevin boil over. This phrase alludes to overflowing while boiling. [Second half of 1800s]
American Heritage Idioms