What do you think what would happen if I didn’t obey his orders?
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means obey so the verb vocab version is to obey.
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: I am going to obey you, but just know I think your order is a bit of shit, が (したが) I'll do it and obey you.