To Destroy, To Annihilate
transitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means destroy and the verb vocab version is to destroy and to annihilate.
ほろぼす
You are going to destroy the hoe roe. This is the roe that comes from the hoe tools. If they create too much roe, they will create too many hoes. And if there are too many hoes, bad things will happen.
奴らはメディアで情報操作を行って、日本を滅ぼそうとしているんだ。
They are trying to ruin Japan by manipulating information.