全神贯注 (quán shén guàn zhù) — to be completely absorbed in, to be engrossed in

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

The shape puts 入 together with 玉 to show a whole piece of jade, so it means complete or whole.

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

The older form 申 drew lightning, which the ancients regarded as divine; 神 adds 示 (god/deity) to mark that meaning.

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

This origin belongs to the traditional form 貫; 贯 is its simplified writing.

The traditional form 貫 originally showed two shells strung together; the simplified 贯 is a later abbreviation.

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

注 combines 水, meaning water, with 主, which gives the sound.