From Longman Dictionary of Contemporary Englishdrop clothˈdrop cloth noun [countable] DH American English a large cloth for covering furniture or floors in order to protect them from dust or paint SYN dustsheet British English
Examples from the Corpus
drop cloth• Question, did you believe that is was safe to proceed with cleaning the oven without the use of a drop cloth?• You cleaned the oven knowing that it was not safe to do that without a drop cloth, correct?• Answer, at several points I did use the drop cloth. 