" Does this phrase have the possibility his thumb is not dirty Generally speaking, it does not. But on the other hand (pun intended), "His fingers are dirty" doesn't necessarily mean that ALL his fingers are dirty. Let's say that it would be very unusual if the speaker meant to exclude the thumbs.
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AnonymousHis fingers are dirty." Does this phrase have the possibility his thumb is not dirtyGenerally speaking, it does not.
AnonymousThen, basically when saying "fingers", "thumbs" are included, aren't they?Yes.