Idiom Definition 1:
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"to hit the roof" - things
a statistic or number that rises very quickly to an unpredicted incredibly high value
Synonyms:
ballistic, bark, berserk, blow, composure, crack, erupt, flare, flash, freak, fume, haywire, lash, nuts, rail, rant, retort, scream, snarl, snap, storm, temper, vent, yell
Idiom Definition 2:
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"to hit the roof" - people
to become very angry