abreisen
to depart
To leave a place in order to begin a journey or travel to another place. It marks the beginning of being away.
Die Hotelgäste müssen bis 11 Uhr abreisen.
The hotel guests must depart by 11 o'clock.

to depart
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to depart
To leave a place in order to begin a journey or travel to another place. It marks the beginning of being away.
Die Hotelgäste müssen bis 11 Uhr abreisen.
The hotel guests must depart by 11 o'clock.

'Abreisen' (to depart) is a separable verb. The prefix 'ab-' goes at the end in a main clause. In subordinate clauses or after a modal verb, the verb stays together.
Wir reisen morgen früh ab.
We are departing early tomorrow morning.
Since 'abreisen' (to depart) describes movement away from a place, the perfect tense is formed with the auxiliary verb 'sein' (to be). A common mistake is using 'haben' (to have).
Meine Eltern sind gestern abgereist.
My parents departed yesterday.
'Abreisen' (to depart) is often used without an accusative object. It describes the action of leaving a place and does not require any additional complement.
Nach dem Frühstück sind die meisten Gäste abgereist.
After breakfast, most of the guests departed.
to stay / remain
'bleiben' and 'abreisen' are opposites, especially when talking about travel. 'bleiben' means that you are still in a place and are not leaving. 'abreisen' means that you leave a place in order to continue traveling or go home. 'abreisen' is used especially for vacations, visits, business trips, or stays in another place. In everyday language, people often simply say 'weggehen' for ordinary places, but when talking about a trip, 'abreisen' is more precise.

Am Sonntag reisen die Gäste nach dem Frühstück ab.
On Sunday, the guests depart after breakfast.
Wir bleiben noch zwei Nächte im Hotel.
We're staying at the hotel for two more nights.