abgelaufen
expired
When the best-before date of a food or medicine has passed and it should no longer be used.
Der Joghurt ist seit einer Woche abgelaufen, ich würde ihn nicht mehr essen.
The yogurt expired a week ago; I wouldn't eat it anymore.

expired / worn down
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expired
When the best-before date of a food or medicine has passed and it should no longer be used.
Der Joghurt ist seit einer Woche abgelaufen, ich würde ihn nicht mehr essen.
The yogurt expired a week ago; I wouldn't eat it anymore.

'Abgelaufen' (expired / worn down) is the past participle of the separable verb 'ablaufen'. It describes a state that has occurred after a time period or deadline has 'abgelaufen' (expired, i.e. come to an end).
Die Frist für die Bewerbung ist gestern abgelaufen.
The application deadline expired yesterday.
The noun described by 'abgelaufen' determines the exact meaning. Does it refer to food, a document, or shoes?
Diese Milch ist abgelaufen, sie riecht schon komisch.
This milk has expired; it already smells strange.
'Abgelaufen' is usually used predicatively with the verb 'sein' (to be). The structure is: subject + ist/war + abgelaufen.
Der Vertrag ist letzten Monat abgelaufen.
The contract expired last month.
In connection with food, people often talk about the 'Mindesthaltbarkeitsdatum' (best-before date). When this date has passed, the product is 'abgelaufen' (expired).
Das Mindesthaltbarkeitsdatum ist abgelaufen, aber der Käse sieht noch gut aus.
The best-before date has expired, but the cheese still looks good.
new
'neu' and 'abgelaufen' are opposites for things that can have a date or a period of validity. 'neu' describes something that was bought, issued, or made only a short time ago. 'abgelaufen' means that a best-before date, a deadline, or a period of validity has already passed. With milk, medicine, IDs, or tickets, the difference is important: something new may still be usable or valid; something expired is no longer usable or valid.

Der Joghurt bleibt im Kühlschrank, weil er seit gestern abgelaufen ist.
The yogurt is staying in the fridge because it has been expired since yesterday.
Für die Reise braucht Lena einen neuen Pass.
Lena needs a new passport for the trip.