5 o'clock shadow
noun/ˌfaɪv əˌklɒk ˈʃædəʊ/
/ˌfaɪv əˌklɑːk ˈʃædəʊ/
(also five o'clock shadow)
[singular]- the dark colour that appears on the chin and sides of a man's face when the hair has grown a little during the day since he shaved in the morning
5点钟阴影：自从早上刮胡子以来，白天的头发长了一点，男人的下巴和脸部两侧就会出现深色