A single line laid down in one motion, and the outline drawn around a shape. Both are one movement made visible.
Old English strīcan (to stroke, to rub, to pass over lightly), from Proto-Germanic *strikan, kin to strike; a single motion made visible keeps the sense of one continuous pass.
A single line laid down in one motion, and the outline drawn around a shape. Both are one movement, made visible rather than merely performed.