To Plan, To Scheme, To Attempt
transitive verb, ichidan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means plan so the verb vocab version is to plan.
くわだてる
You say you have something you need to plan? Cool, whaddaya (くわだ) gonna do?
「何それ？」「わっ！何でもないよ。」「何か企てているでしょう？」
"What is it?" "Ah, nothing!" "You’re planning something, aren’t you?!"
クーデターを企てたが、失敗してしまった。
We planned a coup, but it failed.
コウイチの暗殺を企てていたワニカニユーザーを、ビエトがこっそり始末したらしいぜ。
Apparently there was a Wanikani user who made an attempt on Koichi's life, but Viet quietly got rid of them.