The boss steamrolled the controversial project through despite employees' objections.

steamrolled 是动词 steamroll 的过去式。steamroll 由 steam（蒸汽）和 roll（滚动）组成，原指"蒸汽压路机碾压"，引申为"以压倒性力量强行推进"的意思。这里比喻老板不顾反对强行推进项目的行为。