不可逆转 (bù kě nì zhuǎn) — irreversible; cannot be turned back

A drawing of the thing itself, worn down over three thousand years into a few strokes.

The picture in 不 originally showed a flower’s calyx; the “no” sense came later from a related character, not from this picture.

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

可 pairs 口 (mouth) with 丂 as a sound part; it is tied to air from the mouth, perhaps singing.

Two or more meaningful parts placed together so that their meanings combine into a new one.

The 辶 part shows movement, and 屰 gives the sound and the sense of going against, so the whole depicts moving in the opposite direction.

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

This origin belongs to the traditional form 轉; 转 is its simplified writing.

The traditional form 轉 combines 車, a carriage, with 專 as a sound part; the simplified 转 is a later shorthand.