From Middle English ech other, yche othere, ich othir, eche other, ilk oþer, from Old English ǣlċ ōþer, equivalent to each + other.

• (British) IPA: /iːˈt͡ʃʌð.ə/
• (America, Canada) IPA: /iˈt͡ʃʌð.ɚ/
• (Australia) IPA: /iːˈt͡ʃað.ə/

1. (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:

   Jack and Robert loved each other.

   • 1897 December (indicated as 1898), Winston Churchill, chapter VIII, in The Celebrity: An Episode, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., Ltd., →OCLC ↗:

     Now we plunged into a deep shade with the boughs lacing each other overhead, and crossed dainty, rustic bridges over the cold trout-streams, the boards giving back the clatter of our horses' feet: or anon we shot into a clearing, with a colored glimpse of the lake and its curving shore far below us.

   • 1915, G[eorge] A. Birmingham [pseudonym; James Owen Hannay], chapter I, in Gossamer, New York, N.Y.: George H. Doran Company, →OCLC ↗:

     There is an hour or two, after the passengers have embarked, which is disquieting and fussy. […] Passengers wander restlessly about or hurry, with futile energy, from place to place. Pushing men hustle each other at the windows of the purser's office, under pretence of expecting letters or despatching telegrams.

• one another

• French: l'un l'autre, les uns les autres
• German: einander (but in limited use; see lemma)
• Italian: a vicenda
• Portuguese: um ao outro, se
• Russian: (accusative, genitive) друг дру́га
• Spanish: el uno al otro, entre sí, mutuamente