A small hole through which the propellant charge of a cannon or muzzleloading gun is ignited.

Precarious, delicate, risky, sensitive; of uncertain outcome (by analogy with a ship in shallow water).

(aviation) To perform a touch-and-go landing. / (nautical) To touch bottom lightly and without damage, as a vessel in motion.

A technique of using the keyboard of a computer or typewriter in which the typist operates the keys without needing to look at the keyboard, knowing by heart the keys being allocated to each finger and the space bar to the thumb.

Dealing with or interacting with a human being as opposed to transacting with computers or through high tech. / Human interaction. / Having a high awareness of human complexity, having empathy.

a strip of paper impregnated with nitre, used as a fuse for firing gunpowder, fireworks etc.

The jewelweed, Impatiens noli-tangere, Impatiens capensis, Impatiens parviflora. / The sensitive plant (Mimosa pudica). / The squirting cucumber (Ecballium elaterium). / (archaic) Lupus.

To type with a keyboard or typewriter without having to look at it, knowing where the keys are.

Alternative form of touch of the tar brush

(snowboarding, skateboarding) Any of a plethora of different aerial tricks where one touches the top of one's feet.