each other
fixed phr..fixed phr.. You use this when two or more people do the same action to the other person or people. For example, if you and a friend help one another, you help each other.
fixed phr.. A reciprocal pronoun used to indicate that the members of a plural subject perform an action on one another. It requires a plural subject.
My parents really love each other.
The two friends hadn't seen each other in years, so they had a lot to talk about.
The two competing theories, while seemingly contradictory, actually complement each other in explaining the complex phenomenon.
From Middle English ech other, yche othere, ich othir, eche other, ilk oþer, from Old English ǣlċ ōþer (“each other”), equivalent to each + other. Cognate with Scots ilk other (“each other”), West Frisian elkoar (“each other”), Dutch elkander, elkaar (“each other”).
This phrase always refers back to a plural subject (like 'they' or 'we').
Contrast with 'one another'; while traditionally 'each other' was for two and 'one another' for more than two, they are now largely interchangeable in modern English.
The student helps each other.The students help each other.'Each other' requires a plural subject because the action must happen between two or more people.