Etymology tree Proto-Indo-European *lek-der.? Latin locusta Anglo-Norman locustebor. Middle English locuste English locust Inherited from Middle English locuste, locust, from Anglo-Norman locuste, Middle French locuste, and their source, Latin locustam (“locust, crustacean, lobster”, accusative of locusta). Doublet of langouste. Noun sense 3 (“kind of tree”), originally referring to the carob (compare locust bean), is based on the resemblance of the trees' beanlike seed pods to the insect and is likely a semantic loan from Ancient Greek ἀκρίς (akrís). Noun sense 5 (“mainlander”) is a semantic loan from Cantonese 蝗蟲 /蝗虫 (wong4 cung4), also meaning "locust".
1
Any of the grasshoppers, often polyphenic and usually swarming, in the family Acrididae that are very destructive to crops and other vegetation, especially migratory locusts (Locusta migratoria).
2
Historical A fruit or pod of a carob tree (Ceratonia siliqua).
Among other articles, they brought with them a great quantity of locusts, which are a kind of pulse, sweet and pleasant to the palate, and in shape resembling French beans, but longer.1789, Olaudah Equiano, chapter 9, in The Interesting Narrative, volume I:
3
Any of various often leguminous trees and shrubs, especially of the genera Robinia and Gleditsia; locust tree.
I took my flogging like a stone. If I had sung, some of the convicts would have given me some lush with a locust in it (laudanum hocussing), and when I was asleep would have given me a crack on the head that would have laid me straight.1851, Henry Mayhew, London Labour and the London Poor, published 1861:
Etymology tree Proto-Indo-European *lek-der.? Latin locusta Anglo-Norman locustebor. Middle English locuste English locust Inherited from Middle English locuste, locust, from Anglo-Norman locuste, Middle French locuste, and their source, Latin locustam (“locust, crustacean, lobster”, accusative of locusta). Doublet of langouste. Noun sense 3 (“kind of tree”), originally referring to the carob (compare locust bean), is based on the resemblance of the trees' beanlike seed pods to the insect and is likely a semantic loan from Ancient Greek ἀκρίς (akrís). Noun sense 5 (“mainlander”) is a semantic loan from Cantonese 蝗蟲 /蝗虫 (wong4 cung4), also meaning "locust".
1
To come in a swarm.
This Philip and the black-faced swarms of Spain, The hardest, cruellest people in the world, Come locusting upon us, eat us up, Confiscate lands, goods, money […]1875, Alfred Tennyson, Queen Mary: A Drama, London: Henry S. King & Co., →OCLC, (please specify the page):