
der Schwamm
sponge
A porous, absorbent cleaning tool used for washing or cleaning.
Kannst du mir bitte den Schwamm geben, um den Tisch abzuwischen?
Could you please give me the sponge so I can wipe the table?
sponge
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sponge
A porous, absorbent cleaning tool used for washing or cleaning.
Kannst du mir bitte den Schwamm geben, um den Tisch abzuwischen?
Could you please give me the sponge so I can wipe the table?

dry rot
A fungus that often attacks and decomposes wood or masonry.
Im Keller wurde ein Befall durch den Echten Hausschwamm festgestellt.
An infestation of true dry rot was found in the basement.

let's forget it
A fixed expression meaning that one should forget about something and not talk about it anymore.
Wir waren uns uneinig, aber egal, Schwamm drüber!
We disagreed, but never mind, let's forget it!

sponge
A sessile aquatic animal with a porous body.
Beim Tauchen sahen wir viele bunte Schwämme am Korallenriff.
While diving, we saw many colorful sponges on the coral reef.
The meaning of 'Schwamm' depends strongly on the context. In the kitchen, it is a cleaning tool; in the basement of a house, it is a dangerous fungus; and in the sea, it is an animal.
Ich brauche einen neuen Schwamm für die Küche.
I need a new sponge for the kitchen.
'Schwamm drüber!' (let's forget it!) is a fixed expression. You use it to end an argument and signal that you want to forget the matter and not talk about it anymore.
Okay, wir hatten verschiedene Meinungen, aber jetzt ist es auch egal. Schwamm drüber!
Okay, we had different opinions, but it doesn't matter now. Let's forget it!
In connection with a cleaning sponge, the verbs 'ausdrücken' (to squeeze out), 'nass machen' (to wet), and 'abwischen' (to wipe) are often used.
Kannst du bitte den Schwamm nass machen und den Tisch abwischen?
Could you please wet the sponge and wipe the table?
When 'Schwamm' is mentioned in the context of buildings, basements, or wood, it almost always refers to the harmful fungus. This is a serious problem and has nothing to do with cleaning.
Die Sanierung des alten Hauses wird teuer, weil überall der Schwamm ist.
The renovation of the old house will be expensive because there is dry rot everywhere.
mushroom / fungus
„Pilz“ refers here to the organism in general, whereas „Schwamm“ means a specific fungus that attacks and decomposes wood or masonry. Both words can be appropriate for an infestation in a building. If only the biological infestation is meant, „Pilz“ is appropriate; for this particular building-damaging fungus, „Schwamm“ is more precise.

An der feuchten Wand hat sich Schwamm ausgebreitet und bereits das Holz zersetzt.
Dry rot has spread across the damp wall and has already decomposed the wood.
An der feuchten Wand hat sich ein Pilz ausgebreitet, dessen genaue Art noch unklar ist.
A fungus has spread across the damp wall, but its exact species is still unclear.