Meaning of grey fly in English:
grey fly
noun
(In later use) the stable fly, Stomoxys calcitrans.
Origin
Mid 17th century; earliest use found in John Milton (1608–1674), poet and polemicist.
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(In later use) the stable fly, Stomoxys calcitrans.
Mid 17th century; earliest use found in John Milton (1608–1674), poet and polemicist.