a rehearsal or practice exercise.
Military. practice in firing arms without using live ammunition.
(military) practice in weapon firing, a drill, or a manoeuvre without using live ammunition
(informal) a trial or practice, esp in simulated conditions; rehearsal

noun phrase

A tryout, practice version, or rehearsal of something planned: One more dry run, then tomorrow we do it (1940s+)


: so the medical staff could ”dry run” their equipment
A trial exercise or rehearsal, as in Regard this as a dry run for tonight’s ceremony. This term, using dry in the sense of “unproductive,” was at first employed mainly in the military for simulated bombings in which no bombs were dropped. [ c. 1940 ]


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