The term DEAD STOP can be broken down into two crossword solutions: HALTS (5 letters) and DROP (4 letters). HALTS is a verb meaning to come to an abrupt end or cease, while DROP is a verb meaning to let fall or come down freely under the influence of gravity. Together, these two words form the phrase DEAD STOP, which is a nautical term used to describe a situation in which a vessel must stop suddenly due to an emergency or other unforeseen circumstance.