variants:
or beach hopper
Definition of beach flea
: any of various amphipod crustaceans (family Talitridae) found on ocean beaches that feed on decaying organic matter, typically burrow into the sand during the day, and are capable of leaping like fleas : sand flea sense 2
You know those tiny beach fleas that are so small they're difficult to spot among the grains of sand? — The Wall Street Journal
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Merriam-Webster unabridged
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Time Traveler for beach flea
The first known use of beach flea was in 1835
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