杯水之谢

Explanation: Analogy meager reward 　　Usage: Partial official; as object; with compliment 　　Source: Qing Wu Jingzi "Scholars" 51 back: "The next day, Phoenix really not a million, four-father in the book, have not been affected by the thank his glass of water, take road to go to Hangzhou." Thesaurus:  Glasses of water the King