逆
nì · HSK 7
contrary
🔙 辶 walk + 屰 an upside-down person = moving against the flow
The 屰 part is a person flipped head-down, so the whole character means going backwards or against. Pronunciation nì sounds like knee, which bends the wrong way when you go in reverse.
逆 — 辶 walk + 屰 (inverted 大 person)
逆 combines the walking radical 辶 with 屰, a pictograph of an upside-down person. The original sense was 'to meet, go against the flow,' as if walking toward someone coming the opposite way. From this it extended to mean 'reverse, contrary, disobey.'