The term 'on the hook' is an idiom that means to be held responsible or accountable for something. The two crossword solutions for this term are 'hung' and 'LIABLE'. 'Hung' is a four letter word meaning to be suspended or held in place, while 'LIABLE' is a six letter word meaning legally responsible or obligated. Therefore, the phrase 'on the hook' can be interpreted as being held responsible or accountable for something, either physically or legally.