執筆忘字 [执笔－－]

Jyutping zap1 bat1 mong4 zi6
Pinyin zhí bǐ wàng zì

Definitions (CC-CANTO)
  1. character amnesia
Definitions (Wiktionary)
  1. phrase, idiomatic
    to forget how to write Chinese characters; to suffer from character amnesia
    (syn.) 提筆忘字, 提笔忘字
Examples (粵典–words.hk)
  1. Cantonese
    执笔忘字
    執筆忘字
    • to forget how to write a character when one writes