the one (thing)
"The one ___" means that there's just one of something, which the listener already knows about. For example:
A: Do you have any other children?
B: No, just the one boy.
"The one ___" means that there's just one of something, which the listener already knows about. For example:
A: Do you have any other children?
B: No, just the one boy.
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