Beach flea Meaning, Definition & Usage

  1. noun small amphipod crustaceans that hop like fleas; common on ocean beaches
    sand hopper; sand flea; sandhopper.

WordNet

Definitions
  1. (Zoöl.), the common name of many species of amphipod Crustacea, of the family Orchestidæ, living on the sea beaches, and leaping like fleas.

Webster 1913