Questions & Answers about Det høres ut som en god idé.
You need det because Norwegian normally requires a subject in finite clauses, just like English does.
Here det is a dummy subject (like it in It sounds like a good idea).
Saying Høres ut som en god idé without det sounds incomplete or very non‑standard in normal speech.
The verb høre means to hear, and høres is its passive/mediopassive form, which often translates as sounds.
- Det høres ut literally: It is heard out / It sounds out, but idiomatically just It sounds.
- In practice, Det høres ut som … = It sounds like …
You can say Det høres bra ut (It sounds good) without som, but when you compare with a noun phrase (like a good idea), you normally use høres ut som.