touch and go

Short definition from Wiktionary

Adjective

1. 1
   Characterized by brief and transitory encounters.
2. 2
   Precarious, delicate, risky, sensitive; of uncertain outcome (by analogy with a ship in shallow water).
3. 3
   Alternative form of touch and go.

Verb

1. 1
   To briefly encounter before moving on.
2. 2
   To touch bottom lightly and continue without damage, as a vessel in motion.
3. 3
   To perform a touch-and-go landing.

Noun

1. 1
   Ellipsis of touch-and-go landing.