You will stand to lose if you do business with him. 跟他作生意你是要吃亏的。
If one is prepared, one will be safe; if not, one will suffer.; Preparedness ensures security; unpreparedness invites disaster. 有备才能无患,无备必定吃亏。
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)