大客户 (dà kè hù) in Chinese can be translated to "key account" or "major account" in Engpsh.

This term comes from the business industry and refers to a customer who brings in a significant amount of revenue or has a large impact on a company's business operations. These customers are considered important and are given special attention and resources by the company.

Example sentences in Engpsh with Chinese translations:

Our company has designated several key accounts that we prioritize in terms of service and support.
我们公司已经指定了几个重要客户，我们优先考虑服务和支持。

The sales team is responsible for maintaining strong relationships with our major accounts.
销售团队负责与我们的重要客户保持良好关系。

Key account management is a crucial component of our business strategy.
重要客户管理是我们商业策略的关键组成部分。