That businessman is a real cut-throat, willing to ruin competitors for his deals.

cut-throat 是由动词短语 cut throat（割喉）组成的复合形容词，字面意思是"割喉的"，引申为"残酷无情的"或"恶性竞争的"。在商业语境中，形容为了利益不择手段、极度残酷的竞争行为。