five o'clock shadow
noun [ S ] uk/ˌfaɪv.ə.klɒk ˈʃæd.əʊ/ us/ˌfaɪv.ə.klɑːk ˈʃæd.oʊ/
（尤指男性下巴上当天长出的）胡子茬
the slight darkness on a man's face, especially his chin, caused by the growth of hair during the day
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