also earplug, "piece of wax, rubber, cotton, etc., inserted in the ear as protection against noise or water," 1841, from ear (n.1) + plug (n.).

also ear-shot, "reach of hearing, the distance at which something may be heard," c. 1600, from ear (n.1) + shot (n.) in the sense of "range" (as in bowshot).

Old English eorþe "ground, soil, dirt, dry land; country, district," also used (along with middangeard) for "the (material) world, the abode of man" (as opposed to the heavens or the underworld), from Proto-Germanic *ertho (source also of Old Frisian erthe "earth," Old Saxon ertha, Old Norse jörð, Middle Dutch eerde, Dutch aarde, Old High German erda, German Erde, Gothic airþa), perhaps from an extended form of PIE root *er- (2) "earth, ground."

The earth considered as a planet was so called from c. 1400. Use in old chemistry is from 1728. Earth-mover "large digging machine" is from 1940.

"to commit (a corpse) to earth," late 14c., from earth (n.). Related: Earthed; earthing.

c. 1600, "firmly fixed in or on the earth," from earth (n.) + bound (adj.). Figurative sense "bound by earthly ties or interests" is from 1869.

as an annual ecological awareness event on April 22, from 1970; the idea for it and the name date from 1969.

early 13c., "made of earth;" see earth (n.) + -en (2). Not attested in Old English (where eorðen meant "of or in the earth"). Cognate of Old High German irdin, Dutch aarden, Gothic airþeins. Meaning "made of clay" is attested from late 14c.

vessels or other objects of baked or dried clay, 1670s, from earthen + ware (n.). Old English eorðwaran meant "earth-dwellers."

late 14c., "containing or resembling the substance earth," from earth (n.) + -y (2). Of tastes, smells, etc., from 1550s. Figurative sense of "coarse, unrefined" is from 1590s. Related: Earthiness.

Old English yrþling "plowman" (see earth (n.) + -ling); the sense of "inhabitant of the earth" is from 1590s and might be a re-formation, as the word seems to be missing in Middle English. Compare earthman. Earlier in this sense was earthite (1825).