
zwischendurch
in between
In the time between two other activities or events; as a short interruption.
Ich habe heute viel zu tun, aber zwischendurch muss ich kurz etwas essen.
I have a lot to do today, but in between I need to eat something quickly.
in between / occasionally
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in between
In the time between two other activities or events; as a short interruption.
Ich habe heute viel zu tun, aber zwischendurch muss ich kurz etwas essen.
I have a lot to do today, but in between I need to eat something quickly.

occasionally
From time to time; occasionally or now and then.
Meistens ist es hier ruhig, aber zwischendurch wird es auch mal richtig laut.
Most of the time it is quiet here, but occasionally it can get really loud.
'Zwischendurch' is made up of the words 'zwischen' (between) and 'durch' (through). It describes an action that takes place in a gap 'between' other events.
Ich habe keine Zeit für eine richtige Pause, aber ich kann zwischendurch einen Apfel essen.
I don't have time for a proper break, but I can eat an apple in between.
As an adverb, 'zwischendurch' (in between/occasionally) can be placed flexibly in the sentence. It often appears in position 1 to emphasize the action, or in the middle field after the conjugated verb.
Zwischendurch hat es kurz geregnet.
It rained briefly in between.
This word is very commonly used for short everyday activities that interrupt something else. Typical examples are 'zwischendurch etwas trinken' (to drink something in between), 'zwischendurch kurz anrufen' (to call briefly in between), or 'zwischendurch mal aufstehen' (to stand up now and then/in between).
Bei der langen Autofahrt sollten wir zwischendurch mal die Beine vertreten.
During the long car ride, we should stretch our legs in between.
by now / meanwhile
Both words can refer to an action taking place during another activity. “Inzwischen” tends to describe what happens in parallel during that time, while “zwischendurch” usually marks a short interruption or break. Use “inzwischen” for parallel processes and “zwischendurch” for an inserted action.

Während ich den Bericht schreibe, mache ich zwischendurch eine kurze Pause.
While I write the report, I take a short break in between.
Während ich den Bericht schreibe, bereitet meine Kollegin inzwischen die Präsentation vor.
While I write the report, my colleague is meanwhile preparing the presentation.