Hey, doesn’t it smell like leaking gas?
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means leak so the verb vocab version is to leak.
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: Causing you to leak all over the floor (we're talking blood, here) is your friend Moe (も). If you know someone named Moe, imagine them doing this. If you don't, think of a famous Moe.