hit, resign
擲 centers on a forceful, decisive action: striking or throwing something away. The 'resign' sense extends this to throwing away one's position or hopes.
擲 combines 扌 (hand) with 鄭, which likely contributes the sound and may relate to an older meaning of throwing or discarding. The exact historical development is uncertain.
The hand radical 扌 beside the complex 鄭 suggests a hand forcefully throwing something away or striking. Imagine a hand hurling a heavy object to the ground in resignation.
For テキ, picture a hand throwing a tech gadget in frustration: tech -> テキ, and the hand hurls it away.
throw; throwing
grenade
casting off; casting away
being lavish with one's money; spending a huge sum of money at once on a treat
stake all (on something); play for all or nothing; throwing all into a task
thrashing; beating
throwing spear; javelin
throwing event (e.g. javelin, discus, shot put)
grenadier; grenade thrower
grenade launcher
grenade launcher
abandoning; giving up; quitting
defenestration (throwing something or someone out the window)