ゆだん
inattention, carelessness
The oil runs out and the machine seizes, which is what dropping your guard for one second does. You ゆ, Dan だん, eyes on it: it ends in a big accident: ゆだん.
油断大敵 is the set phrase: carelessness is the great enemy.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.