downstroke
UK[ˈdaʊnstrəʊk]US[ˈdaʊnstroʊk]
n
A downward stroke, especially one made by a pen, brush, or other writing or drawing implement.
n
The downward movement of a piston in a cylinder.
Morpheme Breakdown
down
stroke
down
direction
stroke
movement
Etymology
The word 'downstroke' is a transparent compound formed within English from two native Germanic elements. The first element, 'down', originates from Old English dūn, which referred to a hill, a concept inherently associated with a downward slope. The second element, 'stroke', derives from the Old English verb strīcan, meaning to move or pass lightly over a surface. The semantic logic of the compound is straightforward and literal: a 'stroke' that moves 'down'. This concrete meaning, initially applied to the movement of a hand or tool, has been consistently maintained from its formation into modern technical usage, whether describing penmanship, mechanical motion, or typography.
Analysis
Structure: down (direction) + stroke (movement)
- down: From Old English dūn, of Germanic origin, related to a hill or downward direction. In this compound, it functions as an adjective/adverb denoting direction.
- stroke: From Old English strācian (to stroke), related to strīcan (to go, move). In this compound, it functions as a noun denoting a single movement or mark.
Examples
The calligrapher practiced making each downstroke perfectly straight and even.
In this engine design, the power is generated on the downstroke of the piston.
The letter 't' requires a firm downstroke followed by a crossbar.