スイ, と.げる, つい.に
consummate, accomplish, attain, commit (suicide)
JLPT1 G7 S12 F1423
The relevant seal inscription form of the right-hand element# is 豕 pig/boar + 八 split right and left → pig/boar being butchered. 遂 adds 辵 movement → drag a heavy object such as a pig/boar along a winding course all the way to its destination (compare 水) → *carry through* → *accomplish*; *attain*; *achieve*; *wind up* (making/doing). In derivative characters, 遂 also appears in the form seen for example in 隧 and 燧.
[Full Kanji Etymology List]