knock off, drop - stop pursuing or acting; "drop a lawsuit"; "knock it off!"

leave off - stop using; "leave off your jacket--no need to wear it here"

sign off - cease broadcasting; get off the air; as of radio stations

retire, withdraw - withdraw from active participation; "He retired from chess"

pull the plug - prevent from happening or continuing; "The government pulled the plug on spending"

close off, shut off - stem the flow of

cheese - used in the imperative (get away, or stop it); "Cheese it!"

call it a day, call it quits - stop doing what one is doing; "At midnight, the student decided to call it quits and closed his books"

break - give up; "break cigarette smoking"

end, cease, terminate, finish, stop - have an end, in a temporal, spatial, or quantitative sense; either spatial or metaphorical; "the bronchioles terminate in a capillary bed"; "Your rights stop where you infringe upon the rights of other"; "My property ends by the bushes"; "The symphony ends in a pianissimo"

fizzle, fizzle out, peter out, taper off - end weakly; "The music just petered out--there was no proper ending"

leave off - come to an end, stop or cease; "the road leaves off at the edge of the forest"; "leave off where you started"

expire, run out - lose validity; "My passports expired last month"

fracture - become fractured; "The tibia fractured from the blow of the iron pipe"

terminate, end - bring to an end or halt; "She ended their friendship when she found out that he had once been convicted of a crime"; "The attack on Poland terminated the relatively peaceful period after WWI"

bog down, bog - get stuck while doing something; "She bogged down many times while she wrote her dissertation"

cut off, disrupt, interrupt, break up - make a break in; "We interrupt the program for the following messages"