Rush-hour definition

A period of heavy traffic.
noun
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A time of the day when business, traffic, etc. are especially heavy.
noun
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Of or pertaining to the rush hour.

The rush-hour trains are normally extremely busy.

adjective
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(idiomatic) The times of the day when traffic jams are commonplace, due mainly to people commuting to or from work.

It takes 30 minutes to drive there, but maybe 2 hours during the rush hour.

noun
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Other Word Forms

Noun

Singular:
rush-hour
Plural:
rush-hours