Koichi left a note for Viet in a hurry and stayed in the toilet for an hour.
Koichi heard that Viet broke down from working too much, so he hurried to the hospital.
"Hey, hurry up! We’ll be late." "I just woke up, I’m coming."
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means hurry so the verb vocab version is to hurry.
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: Someone who is trying to hurry is someone who is not at ease (いそ).