dither

Concise Oxford English Dictionary © 2008 Oxford University Press:
dither/ˈdɪðə(r)/

▶verb

• 1 be indecisive.

• 2 Computing display or print (a colour image) without sharp edges so that it appears to contain extra colours.

▶noun informal

• 1 a state of dithering.

• 2 a state of agitation.

– derivatives
ditherer noun,
dithery adjective.

– origin C17 (in the dial. sense ‘tremble, quiver’): var. of dial. didder; rel. to dodder1.