hate, abhor, hatred, resentment
懟 centers on intense negative emotion directed at someone or something: hatred, abhorrence, and deep resentment.
懟 combines 心 (heart/mind) with 對, which likely contributes the sound and may suggest opposition or facing, together expressing a heart set against someone.
The top 對 suggests facing off against someone, and the bottom 心 is the heart. Picture a heart full of hatred when confronting an enemy.
For ツイ, imagine two people facing off with intense hatred, and one says 'Tsuih!' as a sharp, dismissive sound: tsuih -> ツイ.