Pronunciation: (u-sāl'),[key] —v.t. 1. to attack vigorously or violently; assault.
2. to attack with arguments, criticism, ridicule, abuse, etc.: to assail one's opponent with slander. 3. to undertake with the purpose of mastering: He assailed his studies with new determination. 4. to impinge upon; make an impact on; beset: His mind was assailed by conflicting arguments. The light assailed their eyes.