From Longman Business Dictionary
slowdownslow·down /ˈsləʊdaʊnˈsloʊ-/ noun1[countableC usually singular] when something gets slowerslowdown inThere’s been a slowdown in domestic demand for automobiles.
A spokesman blamed heavy competition and the international economic slowdown for the job losses.
2[countableC] American EnglishAmEHUMAN RESOURCES a period of time when people deliberately work slowly in order to protest about somethingSYN BrE go-slowThe unions already have a work slowdown under way.