タツ, ダ, たち, かつ, さと, て, てつ, とおる, みち
accomplished, reach, arrive, attain
JLPT3 G4 S12 F500
Originally, 辵 movement + an element combining 大 great and 羊 sheep → procession of a great flock of sheep → *proceed smoothly*; *arrive at*; *reach* → *achieve*; *be in use*; *notice*; *deliver*; *skillful*. Suffix meaning a *plural number of humans* is a borrowed meaning.
[Full Kanji Etymology List]