投
トウ, な.げる, な.げ

throw, discard, abandon, launch into, join, invest in, hurl, give up, sell at a loss

JLPT3 G3 S7 F236

As per 殳# (throw) + 手 hand/action indicator → *throw*; *fling*; *cast* → (cause to) *stay* (← throw and cause to stick in place) → *sell at a loss* (← practically throw away).

[Full Kanji Etymology List]