éponge

/epɔ̃ʒ/éponge
1.
nounfeminine

sponge (cleaning implement or porous material that absorbs liquid)

Passe un coup d'éponge sur la table, c'est dégueulasse.

Wipe the table with a sponge, it's disgusting.

2.
nounfeminine

figurative: someone or something that soaks up or absorbs (information, emotions, liquid, etc.)

Il apprend vite, c'est une éponge : il retient tout.

He learns fast; he's a sponge — he retains everything.