Définitions
1.AdjectiveCharacterized by brief and transitory encounters.
2.AdjectivePrecarious, delicate, risky, sensitive; of uncertain outcome (by analogy with a ship in shallow water)."His condition was touch and go for a time after the accident, but they think he will recover.; I could sense it was touch and go whether I could get the lay."
3.VerbTo briefly encounter before moving on.
4.VerbTo touch bottom lightly and continue without damage, as a vessel in motion.
5.VerbTo perform a touch-and-go landing.