boil over

US /bɔɪl ˈoʊ.vər/
UK /bɔɪl ˈoʊ.vər/
"boil over" picture
1.

for a liquid to overflow a container while boiling

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The milk started to boil over when I wasn't watching.
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Be careful, the pasta water might boil over.
:
overflowspill overbubble over
2.

for emotions or a situation to become intense and uncontrollable

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The tension in the room began to boil over.
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His anger finally boiled over and he yelled at everyone.
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eruptflare upexplodeescalate
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boilboiling pointboil downhard-boiledsoft-boiledboil down toboil up