The term 'READY TO SNAP' can be summarized by three crossword solutions: TENSE (5 letters), TESTY (5 letters), and TAUT (4 letters). TENSE is an adjective meaning 'stiff or strained, as from fatigue, anxiety, or the like'. TESTY is an adjective meaning 'irritable or peevish, especially from being tired or frustrated'. TAUT is an adjective meaning 'tightly drawn; not slack; trim'. All three words describe a person who is on edge, TENSE, and ready to snap.