Meaning of “sand” - Learner’s Dictionary

sand

noun [ U ] us uk /sænd/
Extra Examples
She wriggled her toes in the warm sand.My feet keep sinking into the sand.I've got a grain of sand in my eye.John laid his towel out on the sand.The builders are expecting a delivery of sand.

B1 a substance that is found on beaches and in deserts, which is made from very small grains of rock:

a grain of sand

(Definition of “sand noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)