Dry-run meaning

A trial exercise; a rehearsal.
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A test exercise in combat skills without the use of live ammunition.
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(mil. slang) Practice in firing without using live ammunition.
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(informal) A simulated or practice performance; rehearsal.
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(idiomatic) A practice; a rehearsal.

They did a dry run of the demonstration before showing it to the CEO.

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Alternative spelling of dry run.
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Origin of dry-run

  • dry (in the slang sense of "impotent" or "harmless") + run. First attested in print in 1941, but apparently much older in spoken English.

    From Wiktionary