The term 'DROP ABRUPTLY' can be summarized by two crossword solutions: JILT (4 letters) and PLUNK (5 letters). JILT is a verb meaning to reject or abandon someone suddenly and without warning. It is derived from the Middle English word 'jelte', which means to throw away. PLUNK is also a verb, meaning to drop or let fall abruptly. It is derived from the Middle English word 'plonken', which means to plunge or sink. Both words describe the action of dropping something abruptly.