To fall upon with violence; assault; attack.To attack with reasoning, arguments, censure, abuse, criticism, appeals, entreaties, or anything that bears upon the mind or feelings: as, to assail an obnoxious person with jeers.To fall upon; bring something to bear upon or against; come in contact with: as, the ship was assailed by a severe storm.Synonyms Attack, Set upon, Fall upon, Assail, Assault. Attack, literally to fasten to, is the most general of these words. Set upon and fall upon have the vigor of short and familiar words, and they express a sudden, energetic attack. Assail and assault, literally to leap or spring at, are to attack vehemently and perhaps suddenly. Assault is the stronger of the two, and is especially used of attacks with personal violence, as with fists, stones, etc. All five of these words may be extended to warfare, and to contests and struggles of any kind.