flump I. \ˈfləmp\noun (-s) Etymology: imitative : a dull heavy sound (as of a fall); also: a movement producing such a sound < dropped into the chair with a flump > II. verb (-ed/-ing/-s) intransitive verb : to move or fall suddenly and heavily : plump, plop < flumped down into his chair with a sigh > transitive verb : to place or drop with a flump < flumping his books on the table >