I came across this idiom in a title, in association with a noun:
[noun of a product category] — The need of the hour
What does this mean?
"Of the hour" is an expression used to indicate "of the present (short) period":
It doesn't literally mean an hour, but it does imply a short period of time.
Hour here just means a particular point in time. The need of the hour simply refers to some need at some point in time.
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