十年唔耕，九年唔種 [－－－－－－－－种]

Jyutping sap6 nin4 m4 gaang1 gau2 nin4 m4 zung3
Pinyin shí nián wú gēng ， jiǔ nián wú zhǒng

Definitions (粵典–words.hk)
  1. 語句
    技術​好​耐​冇​用過​，​生疏​晒
    loss of skills if not used for a long time

十年唔耕，九年唔種 [－－－－－－－－种]

Jyutping sap6 nin4 m4 gaang1 ，gau2 nin4 m4 zung3
Pinyin shí nián n2 gēng , jiǔ nián m2 zhǒng

Definitions (CC-CANTO)
  1. loss of skills if not used for a long time