regular customer, longtime client
有时我的老主顾会拿白鱼来换给他们船员和家人吃的饭菜。
Sometimes my regular customers bring whitefish to trade for meals for their crew and families.
有很多老主顾,是要靠你拉拢回来的
A lot of old customers will have to be won back by you.
— 英雄本色 (1986)
老主顾了嘛
They’re a regular customer, after all.
— 色‧戒 (2007)
不过,他们从老主顾那里接到的活儿也比预期的多。
However, they also got more work from repeat customers than they expected.