崔
ガイ, サイ, スイ, がけ
cliff, bluff, precipice
JLPT0 G13 S0 F1963
As per 隹# (exert downward pressure) + 山 mountain → *high/towering* cliff/precipice at which one squats for safety (compare the crouching figure as described in 危 and in 負).
[Full Kanji Etymology List]