馬鹿の一つ覚え
Idiom- 1one who knows little often repeats it ; a fool's one bit of knowledge Translated by Jiyomi
Other writings and readings
バカの一つ覚えバカのひとつ覚えばかの一つ覚えばかのひとつ覚え
expressions (phrases, clauses, etc.)
JMdict entry 2419430. Source and licence.