מָרַר

mârar. a primitive root; properly, to trickle (see מַר); but used only as a denominative from מַר; to be (causatively, make) bitter (literally or figuratively); (be, be in, deal, have, make) bitter(-ly, -ness), be moved with choler, (be, have sorely, it) grieved(-eth), provoke, vex.