assault vs beat up

assault

verb
  • To attack, physically or figuratively; to assail. 

  • To threaten or harass. 

noun
  • A non-competitive combat between two fencers. 

  • A violent onset or attack with physical means, for example blows, weapons, etc. 

  • A violent verbal attack, for example with insults, criticism, and the like 

  • An act that causes someone to apprehend imminent bodily harm (such as brandishing a weapon). 

  • An attempt to commit battery: a violent attempt, or willful effort with force or violence, to do hurt to another, but without necessarily touching the person, such as by raising a fist in a threatening manner, or by striking at the person and missing. 

  • The tort whose action is such an act. 

  • The crime whose action is such an attempt. 

beat up

verb
  • To give a severe beating to; to assault violently with repeated blows. 

  • To cause, by some other means, injuries comparable to the result of being beaten up. 

  • To feel badly guilty and accuse oneself over something. (Usually followed by over or about.) 

  • To repeatedly bomb a military target or targets. 

  • To get something done (derived from the idea of beating for game). 

  • To sail to windward using a series of alternate tacks across the wind. 

noun
  • A raid. 

  • A tree planted later than others in a plantation. 

  • A person who, or thing that, has been beaten up. 

  • An artificially or disingenuously manufactured alarm or outcry, especially one agitated by or through the media. 

  • A beating; a hazing. 

adj
  • Battered by time and usage; beaten up. 

How often have the words assault and beat up occurred in a corpus of books? (source: Google Ngram Viewer )