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Longman Dictionary of Contemporary English
each other
pronoun
EXAMPLES FROM OTHER ENTRIES
▪ It's normal for people to ignore each other in an elevator.
▪ José and his uncle hate each other.
▪ The two kids played happily with each other all morning.
EXAMPLES FROM CORPUS
▪ At one point we were kneeling on the floor facing each other, telling and listening to stories simultaneously.
▪ During the show his eccentric machines ran into each other, consumed each other, and melded into broken heaps.
▪ John Champagne and Bob Guadiana complemented each other extremely well.
▪ Store owners kept each other abreast of these unfortunate incidents and warned each other.
▪ The rhythmic clapping convinced him they were dancing, probably teaching each other routines.
▪ They had been arguing about whether they should write to each other.
Douglas Harper's Etymology Dictionary
each other

reciprocal pronoun, originally in late Old English a phrase, with each as the subject and other inflected (as it were "each to other," "each from other," etc.).

Wiktionary
each other

alt. (label en reciprocal pronoun) To one another; one to the other; signifies that a verb applies to two or more entities both as subjects and as direct objects: pron. (label en reciprocal pronoun) To one another; one to the other; signifies that a verb applies to two or more entities both as subjects and as direct objects:

Usage examples of "each other".

For a while they played hacker hide-and-seek, trying to block each other, till Jeremy finally did some sort of end run and persuaded MAPHIS that Leo's domain was now empty, so any instructions coming out of it were system errors and should be ignored.

We just happened to bump into each other," Bayley said, straight-faced.

Above the hum of the car's motor and the mutter of tires on gravel, he heard birds calling to each other, crickets singing in the grass.

There's only room for eight fully functional infomorphs in here, so you and I are going to need each other for conversation, if nothing else.

We ran into each other once in a while, but he never said a damn thing.

I observed as we were rocked together and clung to each other for comfort, if not support.

The Powers cared, perhaps, about themselves, about each other, about heavy cosmic principles, about the Unicorn and the Serpent, of which they were very probably but geometric manifestations They did not care about me, about Coral, about Mandor, probably not even about Oberon or Dworkin himself.

The two singularities come rushing at each other wildly, loop around each other, and then go whirling back out into space.

I think we can help each other, you and Iif you're willing to take a chance.

It does us no good to save the Wanderer if the people aboard her are determined to continue killing each other off.

Gawaine took his cue from the man next to him and crouched down as the two Slavers met beside the cart and went into a lot of hissing, snarling and arm waving at each other, reminding the bardling of nothing so much as the squire's breeding master and his horsemaster carrying on over who was responsible for the condition of the breeding pens and the fences enclosing them.

The chief Slaver looked up at the sudden and unexpectedbut not unfamiliarsound, and found himself staring at men who in turn stared blankly at each other or at their unfettered bodies.

Men looked at each other doubtfully, and then, as if someone had given an unseen signal, they ransome up the road in the direction they had been going, most back the other way.

Gawaine and Cedric, beneficiaries of this one-sided conversation, cast each other a resigned glance.

Girls looked at each other and frowned, as though uncertain how to continue.