听到
tīngdào · HSK 1
hear
👂 听 = hear + 到 = arrive; sound arrives at your ear
听 means listen/hear and 到 means to arrive or reach. Together 听到 literally means a sound has reached you — the act of hearing is completed, not just listening.
听 — mouth 口 + axe 斤 (simplified from 聽)
The traditional form 聽 combined 耳 (ear) with 王, 十, 目, and 心, depicting attentive listening with ear, eyes, and heart. The modern simplified 听 uses 口 (mouth) plus the phonetic 斤 (jīn), a much later shorthand. Despite the 'mouth' component, the meaning 'to listen, hear' was inherited from 聽.
到 — 刂 knife + 至 (phonetic, 'arrive')
到 is a semantic-phonetic compound. 至 ('to arrive') gives both meaning and sound, while 刂 (knife) was added later, likely as a phonetic reinforcer or to distinguish the written form. The core sense 'to arrive, reach' comes directly from 至, and 到 has carried that meaning since early script forms.