dith ‧ er /ˈdɪðə $ -ər/ BrE AmE verb [intransitive]
[ Date: 1600-1700 ; Origin: didder 'to shake' (14-19 centuries) ]
to keep being unable to make a final decision about something
dither over/about/between
He accused the government of dithering over the deal.
Stop dithering, girl, and get on with it!
—ditherer noun [countable]