
zueinander
to each other
Expresses a mutual relationship, action, or movement; one to the other.
Nach dem Streit haben sie nur langsam wieder zueinander gefunden.
After the argument, they only slowly found their way back to each other.
to each other
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to each other
Expresses a mutual relationship, action, or movement; one to the other.
Nach dem Streit haben sie nur langsam wieder zueinander gefunden.
After the argument, they only slowly found their way back to each other.

with each other
Describes how things or people stand in relation to each other or whether they go well together.
Die Farben der Möbel passen gut zueinander.
The colors of the furniture go well with each other.
'Zueinander' (to each other) is a pronominal adverb made up of the preposition 'zu' (to) and the reciprocal pronoun 'einander' (each other). It literally means 'zu einander' (to one another) or 'einer zum anderen' (one to the other).
Seid bitte nett zueinander!
Please be nice to each other!
The word 'zueinander' (to each other) always describes a mutual (reciprocal) relationship. Therefore, it requires a plural subject or a subject that represents a group of at least two people or things.
Die beiden Teams verhielten sich fair zueinander.
The two teams behaved fairly toward each other.
A very common expression is 'zueinander passen' (to go well together / to be compatible). It is used to describe that things, such as colors or clothing, or even people, harmonize well.
Ich finde, das blaue Hemd und die graue Hose passen gut zueinander.
I think the blue shirt and the gray pants go well with each other.
with each other
Miteinander and zueinander can both describe a reciprocal conversation. Miteinander emphasizes the shared interaction, while zueinander more strongly highlights the direction of an utterance from one person to the other. For an ordinary conversation, miteinander is usually the better choice; zueinander sounds more targeted or somewhat marked.

Die beiden Nachbarn sprechen ihre Beschwerden direkt zueinander aus.
The two neighbors voice their complaints directly to each other.
Die beiden Nachbarn sprechen freundlich miteinander.
The two neighbors speak to each other in a friendly way.