“to send / to see off” in Japanese is 送, read sou, oku (そう, おく). It is a Grade 3 Kyōiku kanji, taught in year 3 of Japanese elementary school, and appears in words such as 送料 (shipping fee).
What does 送 mean?
手紙を送る。
Same sound, different character — the classic trap. Compare them side by side: