棄
キ, す.てる

abandon, throw away, discard, resign, reject, sacrifice

JLPT1 G7 S13 F901

The relevant seal inscription form is ?as described in 育 (newborn baby) + an element# combining a rectangular disposal bin/basket and 廾 pair of hands → abandon a newborn in a basket → *discard* → *renounce*.

[Full Kanji Etymology List]