aufzufüllen
"Aufzufüllen" is the infinitive form of the German verb "auffüllen". It translates to "to fill up" or "to replenish" in English. The verb is formed by combining the prefix "auf-" with the verb "füllen". The prefix "auf-" often indicates completion, upward movement, or the beginning of something. In the context of "auffüllen", it emphasizes the action of filling something completely or bringing it back to its original level.
The verb can be used in various contexts. For example, one might "auffüllen" a glass of water,