Silk 纟 tied into an auspicious 吉 knot. Before writing, Chinese tradition says people 结绳记事 — knotted cords to record events. Tying became joining, joining became concluding.
结婚 marry (tie the knot — same metaphor as English!), 结果 result (the fruit that forms), 结束 finish. The Chinese knot 中国结 hangs red in doorways every New Year.
SILK tied in a lucky KNOT — to TIE, to JOIN, to CONCLUDE.
结果 read jiēguǒ (1st tone) means 'to bear fruit' literally; read jiéguǒ it's the abstract 'result' — one word, botanical and logical.