逆 (Kanji for opposite)

Onyomi

GYAKU

If you tell me I GOTTA COOL down, I'll do the opposite.

You'll note that the bent dagger radical is bent to the left, rather than the right. Because this kanji means opposite!

So now we can say . . .

Whichever way you move,I'll move the opposite !

( に ) さか*らう

to counter-react, to do the opposite of what you're supposed
★★★☆☆

逆(ぎゃく) xxx

opposite of xxx, or reacting against xxx ★★★★☆ PRE

this is a prefix, meaning "opposite of"- you can put it in front of any word, the way you'd use "Bizarrrro"

逆さま(さかさま) のXXX

upside-down ★★☆☆☆ 1/2 KANA

upside-down or inside-out xxx

逆効果(ぎゃくこうか)

the opposite effect ☆☆☆☆☆
逆 (opposite) + 効果 (an effect) = 逆効果 (the opposite effect )

the opposite effect from what you'd intended.