Definition of peaky in English:

peaky

Line breaks: peaky
Pronunciation: /ˈpiːki
 
/

adjective (peakier, peakiest)

[predic.] British
  • Pale from illness or fatigue; sickly: you’re looking a bit peaky—a change of scene would do you good
    More example sentences
    • She was already starting to look peaky and pale.
    • I won't go into the gory details about what's been making me peaky.
    • I was feeling a bit peaky tonight, and I crept off to bed early, and dropped off, despite the soundtrack burbling away in the background.

Origin

early 19th century: from peak2 + -y1.

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