竞争对手在英语中通常被称为"competitor"。这个词来源于拉丁语的"competere"，意思是"竞争"或"角逐"。例句如下：

Our biggest competitor is the company that has been dominating the market for the past few years.

我们最大的竞争对手是过去几年一直主导市场的公司。

We need to come up with a new strategy to beat our competitors.

我们需要想出一个新策略来击败我们的竞争对手。