The term 'walk out on' can be defined as deserting or abandoning someone, and is often used to describe a situation in which one person leaves another without warning. The crossword solutions for this term are 'DESERT' (6 letters), 'ABANDON' (7 letters), 'JILT' (4 letters), 'LEAVE' (5 letters), and 'leaveinthelurch' (15 letters). All of these words refer to the act of leaving someone suddenly and unexpectedly, and can be used to describe the same action.