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Definition: Form a theory or conjecture about a subject without firm evidence.
Example: Speculate is to buy land way out in the country to build housing because you hear that a new manufacturing plant might be built close buy. To assume to be true without conclusive evidence.
Explanation:
Basically a theory you believe is right, but isn't clearly correct until evidence backs it up...
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vehicle is a car
Explanation:
or it can mean a thing used to express , embody, or fulfill something.
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the last one
Explanation:
he is a distracted speaker, not using his intelligence bit his showmanship.
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need more context please - is Charlie a character from a book? poem? movie? play?