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low‧er3 also lour British English
[intransitive] literary
[intransitive] literary1 when the sky or the weather lowers, it becomes dark because there is going to be a storm [= darken]:
lowering clouds
lowering clouds2 to look threatening or annoyed [= frown]:
The other driver lowered at us as we passed him.
The other driver lowered at us as we passed him.