8 letters · 14 points in Scrabble
verb work hard on something
originEtymology tree Proto-Indo-European *bʰerH- Proto-Indo-European *-us Proto-Indo-European *bʰébʰrus Proto-Germanic *bebruz Old English befer Middle English bever English beaver English -ed English beavered From beaver (“beard or bearded person”) + -ed.
Etymology from Wiktionary, CC BY-SA 3.0