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Douglas Harper's Etymology Dictionary

blow-fly

1720, from fly (n.) + blow (v.1) in an obsolete sense "to deposit eggs, to infect with eggs," in reference to to insects, "apparently connected with old notions of natural history" [OED].

Usage examples of "blow-fly".

Certain gods in this section which relates to the planting of maize are shown as being attacked by vultures and blow-flies.

The hissing blow-fly seeks his love, Whose offspring, supping where they supt, Consume corruption twice corrupt.