多忙
たぼう · tabou · JLPT N1 · noun
busy
多 — two 夕 (evening) stacked
多 originally depicted two pieces of meat (夕, a variant of 肉) stacked together, suggesting abundance. Over time it was reanalyzed as two 'evenings' piled up — many evenings meaning many days, hence 'many, much'. The doubling itself conveys quantity.
忙 — heart radical 忄 + 亡 (lose/perish)
忙 is a semantic-phonetic compound. The heart radical 忄 gives the meaning, suggesting a state of mind, while 亡 (lose, perish) supplies the sound. The image is of a heart so overwhelmed it 'loses itself' — hence 'busy, hurried, flustered'.