けっして
never, by no means
Once the channel is cut the water never runs any other way again. The same kettle けっ as 決意, boiled dry. This is what you put in front of a promise you are not going to break: けっして.
Takes a negative later in the sentence: 決して忘れない, never forget. On its own it is only half a thought.
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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.