When other people accused her of being lazy, he 'leaped to her defense'. [=he quickly began to defend her]
It required a 'leap of the imagination' to picture how the project would look when it was completed.
If you're planning to invest in your friend's company, I advise you to 'look before you leap'.
(..) - Ribs? - Not a chance. You have no idea what's been happening here. We're about to make the quantum leap. A rare-earth metal. Molecularly unstable. Industrial uses, none. And then the aliens came. And we made the connection. (..)2014 Transformers: Age of Extinction
(..) Just put it down for a little while. All right? Just put it down. Boy, I could use a drink, Charlie. How about a cup of coffee? (SCOFFS) Too big a leap for me right now, Charlie. Maybe tomorrow. (LAUGHS) No, a Mr. John Daniels would be preferred. No water, Charlie. No water. (..)1992 Scent of a Woman
(..) He'll die. All right, hold on. Kryptonite. You're asking yourself, "How?" Didn't your dad ever teach you to look before you leap? Crystals. They're amazing, aren't they? They inherit the traits of the minerals around them... ...kind of like a son inheriting the traits of his father! (..)2006 Superman Returns