From Longman Dictionary of Contemporary Englishthe lull before the stormthe lull before the stormPAUSECALMa short period of time when things are calm, that is followed by a lot of activity, noise, or trouble → lull
Examples from the Corpus
the lull before the storm• Then came the lull before the storm.• There was a feeling that something was in the air, that it was the lull before the storm. 