到達
とうたつ · toutatsu · JLPT N1 · noun
reach
到 (arrive) + 達 (reach): two characters, one meaning, 'arrive and get through'
到 means arrive at a place and 達 means get through to it, so the compound stresses fully reaching a goal. Use it for arriving at a destination or attaining a result.
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.