慣

Phono-semantic compound:

心 (heart, mind) – semantic, indicating mental state or inner disposition

貫 (to pierce, to string together) – phonetic element, suggesting continuity and repetition

The image conveys something repeatedly impressed upon the heart, thus forming habit or familiarity.

Strongly tied to ideas of repetition and familiarity, where the mind becomes accustomed through constant exposure.

習慣 (습관) – habit, custom

慣性 (관성) – inertia (lit. "habitual force")

慣例 (관례) – customary practice, precedent

慣行 (관행) – established practice, convention

慣用 (관용) – customary usage, idiom

In physics, 慣性 (inertia) is an extended metaphor from “habit” of motion.