Without doubt, certainly.
Physically secure and certain, non-failing, reliable.
Certain to act or be a specified way.
Certain in one's knowledge or belief.
Yes, expressing noncommittal agreement or consent.
Yes; of course.
You're welcome; polite response to being thanked.
To touch bottom lightly and without damage, as a vessel in motion.
To perform a touch-and-go landing.
Precarious, delicate, risky, sensitive; of uncertain outcome (by analogy with a ship in shallow water).