投

By extension, it can also mean “to hurl,” “to send,” or “to commit (oneself to something).”

Phono-semantic compound:

手 (수, “hand”) – provides the meaning (an action done with the hand);

殳 (수, “club, striking weapon”) – provides the sound.

Originally, the character depicted the act of throwing something by hand, often a stick or weapon. Over time, its meaning broadened from literally throwing objects to also sending forth ideas, efforts, or even entrusting oneself (as in 投身 “to throw oneself into something”).