Caveat emptor Legal expression meaning 'let the buyer beware'. Has almost ceased to apply following the Trade Descriptions Acts, 1968 and 1972 and the Supply of Goods (Implied Terms) Act, 1973. The original assumption implied that a person was legally obliged to exercise hislher own commonsense in buying and would not obtain sympathy from the law if he/she failed to protect himself/herself against deception.