1. [adj]  fully alert and watchful; "played heads-up ball"
2. [adj]  fully awake; "the unsleeping city"; "so excited she was wide-awake all night"

Wide Awake
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1. \Wide`-a*wake"\ (w[imac]d`[.a]*w[=a]k"), a.
   Fully awake; not drowsy or dull; hence, knowing; keen; alert.
   --Dickens.
   

2. \Wide`-a*wake"\, n.
   A broad-brimmed, low-crowned felt hat.