IPA: /bɪˈlɪt.lər/
KK: /bɪˈlɪtlər/
A person who makes someone or something seem less important or less valuable.
He was known as a belittler, always putting others down to feel better about himself.
Belittler → It is formed from "be-" (meaning to make) and "little" (from Old English "lytel", meaning small) and the suffix "-er" (meaning a person who). The word "belittler" refers to a person who makes something seem small or less important.
Think of someone who 'makes' ('be-') something 'small' ('little') — that's why a belittler is someone who diminishes the importance of others.