einer muss

someone has to

→ einer
phrase Rare #26,855
someone has to Usually means that at least one person must do something. Einer refers to a male person or a person of unspecified gender; the form changes with gender and grammar, as in eines in “Eines musst du wissen” (“There’s one thing you must know”).
GE: Einer muss heute länger arbeiten.
EN: Someone has to work late today.

Zumindest einer muss dort ankommen.

At least one of them has to get there.

— Lohn der Angst (1953)

Einer muss ihm sagen, was passiert ist.

Someone has to tell him what happened.

Aber einer muss es tun.

But someone has to do it.

— Die Kinder des Monsieur Mathieu (2004)

Einer muss den ersten Schritt getan haben.

Someone must have taken the first step.

— In The Mood For Love (2000)

Ob du oder mein Mann, einer von euch muss überleben und einer muss sterben!

Either you or my husband—one of you must survive, and the other must die!

— Rashomon - Das Lustwäldchen (1950)

Aber einer muss ihm helfen.

But someone has to help him.

— Sprich mit ihr (2002)

Einer muss also hier bleiben.

So one of them has to stay here.

— Ponyo - Das große Abenteuer am Meer (2008)