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Children's Dictionary
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agile quick in mind; sharp; alert. [1/2 definitions]
awake very aware; alert. [1/5 definitions]
bolt upright in a stiff, highly alert position.
caffeine a bitter substance found in coffee, tea, chocolate, and some sodas. Caffeine stimulates the heart and nervous system and can cause a person to stay awake and alert.
caution close attention and care; the act of being careful and alert. [1/3 definitions]
on guard alert and prepared.
on one's toes (informal) alert and ready to act.
sharp in a sharp or alert way. [1/10 definitions]
vigilant alert and careful about danger.
warn to tell of a possible danger; alert. [1/2 definitions]
watchful watching closely or carefully; alert.