Beserk is a term derived from Old Norse and means 'without control'. It is often used to describe someone who is in a state of rage or frenzy. The term is also used to describe a type of Norse warrior who fought with reckless abandon. The crossword solution for Beserk is 'AMOK', which is a Malay term meaning 'out of control'. It is often used to describe someone who is in a state of violent frenzy.