及ぶ
およぶ · oyobu · JLPT N1 · verb-godan
to reach
🤚 及 = a hand (又) reaching to catch up with a person (人): to reach, extend to
The hand-reaching-toward-a-person origin explains the sense of extending as far as something. Example: 被害が全国に及ぶ (the damage extends nationwide).
及 — hand 又 reaching person 人
Originally a pictograph showing a hand (又) catching or reaching a person from behind, depicting the act of catching up to someone. The core meaning 'to reach' or 'to catch up to' extended to 'and' (reaching/including more items) and 'in time for'. Modern form simplifies the person and hand into connected strokes.