春江水暖鸭先知

1. • lit. the duck is the first to know if the spring water is warm (idiom)
2. • fig. an expert in the field knows which way the wind blows

Character by character

• 春(chūn)surname Chun
• 江(jiāng)surname Jiang
• 水(shuǐ)surname Shui
• 暖(nuǎn)warm
• 鸭(yā)duck
• 先(xiān)beforehand
• 知(zhī)know