Definition of "locust" in English

noun

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. (now historical) A fruit or pod of a carob tree (Ceratonia siliqua).

3. Any of various often leguminous trees and shrubs, especially of the genera Robinia and Gleditsia; locust tree.

4. A cicada.

5. (Hong Kong, derogatory, offensive, ethnic slur) A Mainlander.

6. (UK, slang, obsolete) A dose of laudanum.

verb

1. (intransitive) To come in a swarm.