The term 'in an abrupt manner' can be summarized by two crossword solutions: 'tersely' (7 letters) and 'cold turkey' (10 letters). 'Tersely' is an adverb meaning in a concise or brief manner, while 'cold turkey' is an idiom that means to stop something suddenly and completely. Both terms imply an abrupt end to something, and are often used when referring to the sudden cessation of an addiction or habit.