This word is made up of the reading from 濡れる and the rendaku version of the きぬ reading of 衣. You learned this reading in the 衣 vocabulary, but here's a mnemonic to remember it. Imagine someone's dumped water on you and you're all wet. You might say "give new (ぎぬ) clothes to me!"
Are you saying I farted? That's a baseless accusation.
Koichi accused me of something he was responsible for.
The only one who believed that it was a false accusation was my dog.