en bas in English:

He came downstairs.

Come downstairs as soon as possible.

We asked him on the interphone if he could come downstairs quickly.

Let's go downstairs for dinner.

There is a lady downstairs who wants to speak to you.

Tom came downstairs in his pajamas.

She came downstairs with a letter in her hand.

The downstairs was rented to a bookseller.

He came downstairs out of the bedroom for breakfast.

When you fall off the stairs, you're downstairs quickly.

We were afraid that we might be hit by a bullet, so we ran downstairs.

he went downstairs to answer the phone

He went downstairs to answer the phone. (On zszedł na dół żeby odebrać telefon.) I went downstairs and turned off the light. (Poszedłem na dół i wyłączyłem światło.)

There is a kitchen and a big living room downstairs

Jimmy, breakfast is ready. Come downstairs.