蘿蔔快了不洗泥

1. • when radishes are selling fast, one doesn't take the time to wash the soil off them (idiom)
2. • fig. when business is booming, merchants tend to offer goods of inferior quality

Character by character

• 蘿(luó)radish
• 蔔(bo)
• 快(kuài)rapid
• 了(le)marks a completed action
• 不(bù)no
• 洗(xǐ)wash
• 泥(ní)mud