the balloon goes up
US /ðə bəˈluːn ɡoʊz ʌp/
UK /ðə bəˈluːn ɡoʊz ʌp/
1.
a serious or unpleasant situation begins to develop
:
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When the boss finds out about the mistake, the balloon goes up.
•
We need to be prepared for when the balloon goes up.