颠 appears in many compounds: 颠倒 (diāndǎo, upside down), 颠覆 (diānfù, to subvert), 颠簸 (diānbǒ, to jolt/bump along). As a standalone verb, it often means bumpy road movement.
memory
Think of 颠 as the bouncing you feel when riding over bumps — the character contains 页 (head/page), suggesting something at the top being tossed around.
