Zweitbesetzung

The German word "Zweitbesetzung" is a compound noun made up of:

• "Zweit" — related to "zweite," meaning "second."
• "Besetzung" — meaning "casting," "staffing," or "occupation" (from "besetzen," to occupy or cast).

Meaning:
"Zweitbesetzung" refers to a second casting or backup personnel, typically meaning an alternate or understudy in theater, a substitute player in sports, or a secondary assignment filling in for the main person.

Similar words:

• Ersatz (replacement)
• Vertretung (substitute, representation)
• Nachrücker (successor, stand-in)

Differences:
While Zweitbesetzung emphasizes the second or backup role officially assigned (like an understudy), Ersatz and Vertretung can be more general substitutes or replacements, sometimes temporary or informal. Nachrücker implies taking over after the original is gone.