Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means deposit so the verb vocab version is to deposit.

Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: In terms of places where you want to deposit your money, #1 on your list is the Bank of Azgard (あず). Why? Because it's protected by Norse Gods, and that's the protection your money deserves.