9 letters · 12 points in Scrabble
verb keep from happening or arising; make impossible
verb act in advance of; deal with ahead of time
originFrom Middle English forestallen (“to forestall, intercept, ambush, way-lay”), from forestalle (“a forestalling, interception”), from Old English foresteall (“intervention, hindrance of justice, ambush”), from fore- (“ahead of, before”) + steall (“position”), equivalent to fore- + stall.
Etymology from Wiktionary, CC BY-SA 3.0