red
頳 centers on the color red, often with a sense of redness showing through the skin, such as blushing or flushing.
頳 combines 赤 (red) with 頁 (head), suggesting redness in the face. The exact historical development is uncertain, but the component structure points to a phono-semantic origin where 赤 provides meaning and 頁 may contribute sound.
The left side 赤 means red, and the right side 頁 is a head. Picture a head turning red with embarrassment: 頳 is that blushing red.
For テイ, imagine a red-faced person taking a sip of tea to calm down: tea -> テイ, and the redness slowly fades.