Other forms: dwindled, dwindling, dwindles
To dwindle is to grow steadily smaller until almost nothing is left. Numbers dwindled, dwindling supplies, dwindle away.
The slowness is the point — a thing that collapses does not dwindle. It is a frequentative of an old verb dwine, meaning to waste away, which has otherwise disappeared. Note the -le ending, which in English often marks repeated small action.
1verbdwindleTo grow steadily smaller until almost nothing is left.
“The crowd dwindled as the rain grew heavier.”
dwindle is a shrinking.
A frequentative of dwine, from Old English dwinan, to waste away. Only the longer form survives.
Proto-Germanic
*dwīnaną
Proto-West Germanic
*dwīnan
Old English
dwīnan — to waste away
Middle English
dwynen
English, today
dwindle
Frequentative form of dwine, from Middle English dwynen, from Old English dwīnan (“to waste away”), from Proto-West Germanic dwīnan, from Proto-Germanic dwīnaną. It is equivalent to dwine + -le, akin to Old Norse dvena, dvína, Dutch verdwijnen (“to disappear, dwindle”).
Etymology from Wiktionary, CC BY-SA