Meaning of “earth” - Learner’s Dictionary

earth

noun uk us /ɜːθ/
PLANET [ no plural ] (also the Earth)

B1 the planet that we live on

SUBSTANCE [ U ]

B2 soil or ground:

a mound of earth
ELECTRICAL WIRE [ C ] UK (US ground)

a wire that makes electrical equipment safer

cost/charge, etc the earth UK informal

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