the calm before the storm
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calm before the storm
A period of inactivity or tranquility before something chaotic begins. Likened to a literal period of calm before a storm begins. Oh, this is the calm before the storm—the dinner rush will turn this place into a mad house.
the calm before the stormor
the lull before the storm
COMMON You describe a very quiet period as the calm before the storm or the lull before the storm if it is followed by a period of trouble or intense activity. Things are relatively relaxed at the moment, but I think it's probably the calm before the storm. The Emergency Department is fairly quiet, the lull before the storm. Note: This expression can be varied by replacing the storm with another storm or by adding next before storm. The fragile ceasefire may be just the lull before another storm.