A person or animal that bolts or runs away suddenly; also, a sieve or machine used to sift flour or grains.
From 'bolt' meaning to run away, or from the verb 'bolt' meaning to sift through a bolter (sieve).
The word 'bolter' has two completely unrelated meanings—someone who runs away and a machine that sifts grain—showing how the same word can evolve in different industries.
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