整天
zhěng tiān · HSK 3
whole day
☀️🌙 整 = whole/entire + 天 = day/sky
整 means whole or complete; 天 means day or sky. Together 整天 literally reads as whole-day, meaning all day long from morning to night.
整 — 束 bundle + 攵 tap/strike + 正 correct/upright
A compound character combining 敕 (to arrange, with 束 'bundle' and 攵 'strike/action') over 正 ('upright, correct'). The image is of striking a bundle into proper alignment, giving the meaning 'to put in order, arrange neatly.' From this came senses of 'whole, complete, tidy.'
天 — 一 (one/sky) above 大 (big person)
Originally a pictograph of a person (大) with an emphasized head, representing what is above — the sky or heavens. The top stroke evolved into 一, symbolizing the vast expanse overhead. From 'sky' it extended to mean 'day,' 'heaven,' and 'nature.'