馬鹿の一つ覚え（ばかのひとつおぼえ）

Japanese vocabulary

Meaning: one who knows little often repeats it; a fool's one bit of knowledge

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “馬鹿の一つ覚え” pronounced in real videos (YouGlish)