sky 
/ˈskaɪ/ noun
plural skies /ˈskaɪ/ noun : the space over the Earth where the sun, moon, stars, and clouds appear [count] ▪ a starry sky ▪ the night/desert sky ▪ There wasn't a cloud in the sky. ▪ Dark clouds moved quickly across the sky. ▪ Hailstones suddenly fell out of the sky. ▪ The sun/moon was high in the sky. ▪ The forecast is for sunny/blue/gray/overcast skies tomorrow. ▪ partly cloudy skies [noncount] ▪ a patch of blue sky
praise (someone or something) to the skies — see 1praise
take to the sky/skies
chiefly US : to begin flying
▪ The new airliner will take to the skies next year.
▪ The new airliner will take to the skies next year.
the sky's the limit — see 1limit
— see also pie in the sky
