retard
🇺🇸
/rɪˈtɑːrd/
🇬🇧
/rɪˈtɑːd/
to slow down the growth or progress of something
Early surgery can retard the disease from getting worse.
早期の手術は病状の悪化を遅らせることが可能です。
a hurtful term for someone you think is very slow or not smart
He called her a retard for not understanding the joke.
彼は彼女が冗談を理解しなかったので、彼女を馬鹿呼ばわりした。