This might depend on the context in which the phrase is used,
but at a guess it refers to a not-too-young man's grey-stubbled
chin - he's not quite got a beard, but he hasn't shaved in a few
days.
Grizzled means having a mix of dark and white hairs.
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According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 1 words with the pattern S-UB---D.
That is, eight letter words with 1st letter S and 3rd letter U and
4th letter B and 8th letter D. In alphabetical order, they are:
stubbled
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According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 5 words with the pattern -TU-BL--.
That is, eight letter words with 2nd letter T and 3rd letter U and
5th letter B and 6th letter L. In alphabetical order, they are:
stubbled
stubbles
stumbled
stumbler
stumbles
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According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 1 words with the pattern STUB---D.
That is, eight letter words with 1st letter S and 2nd letter T and
3rd letter U and 4th letter B and 8th letter D. In alphabetical
order, they are: