放心
fàngxīn · HSK 2
be at ease
😌 放 = release/put down + 心 = heart: put down your heart
放 means to release or put down; 心 means heart or mind. Together: put down your heart — i.e. set it at rest, stop worrying. The English idiom 'rest assured' maps closely.
放 — 方 (square/phonetic) + 攵 (rap/strike radical)
放 is a semantic-phonetic compound: 方 supplies the sound and 攵 (a hand holding a stick) supplies the meaning of striking or driving away. The original sense was to banish or drive out, which broadened over time to 'release', 'let go', and 'put down'.
心 — pictograph of a heart with chambers and aorta
心 is a pictograph showing a stylized heart, with strokes representing the organ's chambers and the aorta at the top. Originally meaning the physical heart, it broadened to cover mind, feelings, and intentions, since ancient Chinese thought located thinking and emotion in the heart.