1
general::
1. Set very high goals, aspire to the best, as in I'm sure they'll make you a partner, so reach for the sky. The sky here stands for high aspirations. Also see SKY'S THE LIMIT. 2. Put your hands up high, as in One robber held the teller at gunpoint, shouting "Reach for the sky!" This usage is always put as an imperative. [Slang; mid-1900s]
American Heritage Idioms
2
general::
Phrase(s): reach for the sky 1. [and] aim for the sky; shoot for the sky
Fig. to set one’s sights high. • Reach for the sky! Go for it! • You should always reach for the sky, but be prepared for not attaining your goals every time. 2. Fig. Inf. to put one’s hands up, as in a burglary. • The gunman told the bank teller to reach for the sky. • Reach for the sky and give me all your money!
McGrawhill's American Idioms And Phrasal Verbs