I. streak 1 /striːk/ BrE AmE noun [countable]
[ Language: Old English ; Origin: strica ]
1 . a coloured line, especially one that is not straight or has been made accidentally:
Sue has blonde streaks in her hair.
2 . a part of someone’s character that is different from the rest of their character:
a mean streak
streak of
His serious nature was lightened by a streak of mischief.
3 . a period of time during which you continue to be successful or to fail
be on a winning/losing streak
Celtic are on a six-game winning streak.
4 . streak of lightning/fire/light etc a long straight flash of ↑ lightning , fire etc
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THESAURUS
▪ stripe a line of colour, especially one of several lines of colour all close together:
the red and white stripes on the US flag
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horizontal stripes
▪ streak a coloured line or thin mark, especially one that is not straight or has been made accidentally:
His hair was black with streaks of grey.
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He saw the red streaks of sunrise in the sky.
▪ band a thick line of colour that is different from the areas around it:
The fish has a black band on its fin.
II. streak 2 BrE AmE verb
1 . [intransitive always + adverb/preposition] to run or fly somewhere so fast you can hardly be seen
streak across/along/down etc
Two jets streaked across the sky.
2 . [transitive usually passive] to cover something with lines of colour, liquid etc:
The sky was streaked yellow and purple.
streak with
His hands and arms were streaked with paint.
3 . [intransitive] to run across a public place with no clothes on as a joke or in order to shock people