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Discover LudwigThe phrase "a thumb" is correct and usable in written English.
It can be used when referring to one of the five digits on a human hand, typically in contexts discussing anatomy, gestures, or actions involving the thumb.
Example: "He gave a thumbs up to show his approval, raising a thumb in the air."
Alternatives: "one thumb" or "a single thumb".
Exact(55)
A thumb.
Analogy: When is a thumb a thumb?
A thumb drive?
Farah flashed a thumb up.
He turned a thumb toward his stripes.
He pointed a thumb at the floor.
Similar(5)
A: "Thumbs up!" -- Mike Ryan, The Huffington Post.
Peel a thumb-sized knob of ginger then slice thinly.
Mine is a thumbs-up.
A thumbs-up from Alcock.
That was a thumbs down.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com