1、讨便宜的解释是：⒈ 占别人的便宜。英：seekundueadvantage;trytogainsthattheexpenseofothers;lookforabargain;讨便宜[tǎopiányi]⒈占别人的便宜。英seekundueadvantage;trytogainsthattheexpenseofothers;lookforabargain。