To stretch is to extend or lengthen something beyond the normal length. You stretched both your vacation and the truth when you called out of work on Monday saying your flight home from Ibiza was canceled.
Stretch is a word that has many great usages. The sense of extending one’s limbs came about circa 1200. Four hundred years later brought the phrase "stretch your legs," meaning take a walk. Don’t walk too vigorously, though, or you could stretch a muscle. The word can also be used as a noun, meaning an expanse, as in, "Looking toward the horizon, the thirsty man saw an endless stretch of sand."