This is the 6068th most frequent German word.
couch
A comfortable piece of furniture for sitting or lying, similar to a sofa.
In this sentence, 'Couch' is used as a noun referring to a piece of furniture used for seating.
Ich sitze gerne auf der Couch.
I like sitting on the couch.
Here, 'Couch' indicates a specific item, pertaining to the speaker's living room furnishings.
Die Couch in meinem Wohnzimmer ist sehr bequem.
The couch in my living room is very comfortable.
In this example, 'Couch' is the object of the decision and describes its color.