Q: Sentence (1) We were hit by really bad weather.
Sentence (2) He hit a home run.. Word: hit.
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A: different meanings

Q: Sentence (1) Flatten your stomach with these exercises.
Sentence (2) Flatten a road.. Word: flatten.
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A: the same meaning

Q: Sentence (1) Sand of a fine grain.
Sentence (2) A stone of coarse grain.. Word: grain.
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A:
the same meaning