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Tell someone they're full of crap and laugh in their face
My mom gainsayed me when I told her I got an A on my math test. She said I must’ve cheated. I didn’t even do my homework.
He gainsayed the whole class when he said the teacher was wrong. The teacher gave him a zero for disrespect.
She gainsayed my brother’s lie about eating all the pizza. She said he just wanted to look cool.