abgelassen
drained / released
Describes a liquid or gas that has been removed or let out of a container, tire, or system.
Das Wasser im Pool war für die Reinigung komplett abgelassen.
The water in the pool had been completely drained for cleaning.

drained / released
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drained / released
Describes a liquid or gas that has been removed or let out of a container, tire, or system.
Das Wasser im Pool war für die Reinigung komplett abgelassen.
The water in the pool had been completely drained for cleaning.

'Abgelassen' is the past participle of the separable verb 'ablassen' (to drain/let out). The prefix 'ab-' means 'away' or 'down', and 'lassen' means 'to let/allow/cause'. So the literal meaning is to let something flow away or escape.
Die Luft aus dem Reifen wurde langsam abgelassen.
The air was slowly let out of the tire.
As a past participle, 'abgelassen' (drained/let out) can stand as an adjective before a noun or be used with the verb 'sein' (to be) to describe a state.
Das abgelassene Öl muss umweltgerecht entsorgt werden.
The drained oil must be disposed of in an environmentally responsible way.
You can recognize the figurative meaning from words that have to do with emotions or pressure. Common signal words are 'Dampf' (steam), 'Druck' (pressure), 'Wut' (anger), or 'Frust' (frustration).
Nachdem all die Wut abgelassen war, fühlte er sich erleichtert.
After all the anger had been let out, he felt relieved.
filled / stuffed
'gefüllt' and 'abgelassen' describe opposite states. 'gefüllt' means that there is something inside a container, room, or object. 'abgelassen' means that a liquid or gas has been let out. This is especially used with water, air, or similar things, for example with a pool or a tire. So the contrast is: something is full or contains something; something has been emptied because the contents were let out.

Vor der Reparatur war das Wasser aus dem Becken abgelassen.
Before the repair, the water had been drained from the pool.
Nach dem Regen war die Tonne bis zum Rand mit Wasser gefüllt.
After the rain, the barrel was filled with water up to the rim.