Since this word has okurigana (hiragana attached to the kanji) you know that it's probably going to be the kun'yomi reading.
Lucky for you, the kanji readings for transitive and intransitive verbs are almost always the same. Once you learn one, you know them both! This reading is the same as 零す.
At the moment I farted, a teardrop fell out of my eyes.
Someone spilled tea on the couch! Who's the guilty one?
A beautiful melody spilled out from the window.