シュウ, くさ.い, くさ.い, にお.う, にお.い
stinking, ill-smelling, suspicious looking, odor, savor, fragrance, be fragrant, stink, glow, be bright
JLPT1 G7 S9 F1760
(Shinjitai) Originally 犬 here an abbreviated form# of 犾 as described in 獄 (pair of dogs) + 自 (nose) → dogs sniffing each other → (foul) *smell* → *reek*; *stench*. 臭 is a variant form dropping one stroke from the 犬 element, the original form remaining in derivative characters such as 嗅 and 糗.
[Full Kanji Etymology List]