The sales industry is cut-throat, with everyone trying to steal each other's clients.

cut-throat 是由动词短语 cut（割）和名词 throat（喉咙）组成的复合形容词，字面意思是"割喉"，比喻"极其残酷、激烈"的竞争状态。这个表达形象地描述了商业竞争中不择手段、你死我活的激烈程度。