(literally) On the head. / (figuratively) Inside the head. / (informal) In the brain or in the mind.

An electrode, in the form of a metal plate buried in external soil, used to earth the electrical system of a building

plural of dog-ear

Third-person singular simple present indicative form of dog-ear

In a state of conflict; fighting, scuffling.

Alternative letter-case form of on earth

Sincere; determined; truthful.

With considerable commitment, determination, or effect; significantly. / (of a person) Having a sincere intent.

(idiomatic, US, military) An American military officer who has attained the rank of colonel but will not be promoted to the rank of general.

(dated) A door allowing earlier access to a theatre for an additional fee.