• (n.) A peddler or hawker, especially of cheap and flashy goods pretended to be smuggled; a duffer. • (v. t.) To confuse or confound with noise. • (v. i.) To shiver or tremble; to dodder.
Dud'der intransitive verb To shiver or tremble; to dodder. « I dudder and shake like an aspen leaf.» Ford. Dud'der noun [ From Duds .] A peddler or hawker, especially of cheap and flashy goods pretended to be smuggled; a duffer. [ Eng.]Dud'der transitive verb [ In Suffolk, Eng., to shiver, shake, tremble; also written dodder .] To confuse or confound with noise. Jennings. 
Dudder is slang for someone who sells dress-pieces.