ボウ, モウ, な.い, な.き, ほろ.びる, ほろ.ぶ, ほろ.ぼす
deceased, the late, dying, perish
JLPT3 G6 S3 F661
The relevant oracle bone form of this character is 人 person + a long vertical line# behind which the person is (partially) concealed (compare 毋). The relevant bronzeware inscription form shows 人 person hidden by an L-shaped object → be partially obscured and dimly visible, or fully obscured and non-existent → *perish*; *fall*; *die*; *dead*; *flee*.
[Full Kanji Etymology List]