5 o'clock shadow

noun
🔊/ˌfaɪv əˌklɒk ˈʃædəʊ/
🔊/ˌfaɪv əˌklɑːk ˈʃædəʊ/
(also five o'clock shadow)
[singular]
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  1. 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