Any of the grasshoppers, often polyphenic and usually swarming, in the family Acrididae that are very destructive to crops and other vegetation, (especially) the migratory locust (Locusta migratoria).
A fruit or pod of the carob tree.
Any of various often leguminous trees and shrubs, especially of the genera Robinia and Gleditsia; the locust tree.
A cicada.
A Mainlander.
To come in a swarm.