to fit together
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to go together
To harmonize; to go well together in terms of qualities, appearance, or character.
Ich finde, die neue Couch und der Teppich passen farblich nicht gut zusammen.
I think the new couch and the rug don't go together well in terms of color.
to fit together
To be able to physically connect with each other or fit into each other.
Die beiden Puzzleteile passen perfekt zusammen.
The two puzzle pieces fit together perfectly.
'Zusammenpassen' (to fit together) is a separable verb. The prefix 'zusammen' (together) goes at the end of the main clause; in a subordinate clause it stays connected to the verb, and in the infinitive with 'zu', 'zu' stands between the two parts.
Diese beiden Farben passen gut zusammen.
These two colors go well together.
The word consists of the adverb 'zusammen' (together) and the verb 'passen' (to fit). The meaning is very literal: things or people 'passen' (fit) 'zusammen' (together).
Die Teile des Schranks passen nicht zusammen.
The parts of the cabinet don't fit together.
When it is about harmony, the verb is often combined with adverbs such as 'gut' (well), 'perfekt' (perfectly), 'überhaupt nicht' (not at all), or 'wunderbar' (wonderfully). You can also describe the aspect more precisely, e.g. 'charakterlich' (in terms of character) or 'optisch' (visually) zusammenpassen.
Als Paar haben sie charakterlich nie wirklich zusammengepasst.
As a couple, they never really went together in terms of character.
You can recognize this meaning by the fact that it is about physical objects that are supposed to connect. Typical subjects are puzzle pieces, building blocks, a key and lock, or machine parts.
Der Deckel und der Topf passen nicht zusammen.
The lid and the pot don't fit together.
to fit / suit / pass
Passen can express that one thing harmonizes with another. Zusammenpassen describes the same harmony from a shared perspective and presents both sides as a matching combination. Therefore, both formulations are possible in many situations.
Die rote Jacke und die schwarze Hose passen gut zusammen.
The red jacket and the black pants go well together.
Die rote Jacke passt gut zu der schwarzen Hose.
The red jacket goes well with the black pants.
