• 逆ぎゃく — reverse / opposite
• 逆転ぎゃくてん — reversal / turnabout
• 逆走ぎゃくそう — going the wrong way
• 逆境ぎゃっきょう — adversity / tough situation
• 逆風ぎゃくふう — headwind / opposing wind
• 逆さからう — to oppose / disobey

逆 combines 辶 (movement) with 屰 (to go against), highlighting motion that turns back or runs counter to flow—hence ideas like reversing, resisting, or opposition.

逆転ぎゃくてんで 勝かった！
We won by a reversal!

上司じょうしに 逆さからうのは 難むずかしい。
It's difficult to go against your boss.