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A thumbs up. It's like saying 'yes' with your hand. It's used by people who are proud of themselves or their choices.
I gave him a thumbs up. He took it as a compliment. I was wrong.
She did the best in class. I gave her a thumbs up. She gave me a thumbs down.
My dog gave me a thumbs up. I gave him a treat. He gave me a sneaky look.