From Longman Dictionary of Contemporary Englishtopsidetop‧side1 /ˈtɒpsaɪd $ ˈtɑːp-/ noun [uncountable] British EnglishDF high quality beef cut from the upper leg of the cow SYN top round American English
Examples from the Corpus
topside• A pound of topside of beef will be £1.54.topsidetopside2 (also topsides /-saɪdz/) adverb TTWtowards or onto the deck (=upper surface) of a boat or ship 