to sit around
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to sit around
Informal for sitting around idly and not doing anything useful, often with a negative connotation of wasting time.
Statt deine Hausaufgaben zu machen, sitzt du schon wieder nur vor dem Fernseher rum.
Instead of doing your homework, you're just sitting around in front of the TV again.
'Rumsitzen' is the colloquial form of the separable verb 'herumsitzen' (to sit around). The prefix 'rum-' makes the word informal and is used mainly in spoken language.
Am Bahnhof mussten wir zwei Stunden rumsitzen und auf den nächsten Zug warten.
At the station, we had to sit around for two hours and wait for the next train.
'Rumsitzen' is a separable verb. In a main clause, the prefix 'rum' moves to the end of the sentence. In the infinitive with 'zu', 'zu' stands between 'rum' and 'sitzen'.
Den ganzen Sonntag saß er nur auf dem Sofa rum.
He just sat around on the sofa all Sunday.
This word is not neutral. It almost always expresses that someone is wasting their time and should actually be doing something more useful. It is often used as a reproach or in self-critical statements.
Hör auf, nur faul rumzusitzen, und hilf mir lieber im Garten!
Stop just sitting around lazily and help me in the garden instead!
to work
'arbeiten' and 'rumsitzen' form a clear contrast here. 'arbeiten' means that someone is doing a professional, physical, or mental activity. 'rumsitzen' is colloquial and means that someone is just sitting around and not doing anything useful. It often sounds reproachful or dissatisfied. So the difference is not just between moving and sitting, but above all between being active and being inactive.
Statt zu helfen, sitzt Tom nur im Wohnzimmer rum.
Instead of helping, Tom is just sitting around in the living room.
Luisa arbeitet heute zu Hause, weil sie den Bericht fertig machen muss.
Luisa is working from home today because she has to finish the report.