KanjiJLPT N1
Stinking

stinking, ill-smelling, suspicious looking, odor, savor, fragrance, be fragrant, stink, glow, be bright

Mnemonic

Smell oneself after a big workout and the result is stinking. You raise your arm, take one big whiff of yourself, and nearly pass out from the fumes. The bigger you push oneself, the worse the stinking gets!
Additional thoughts
Picture the kanji structure: oneself (自) sits on top of big (大), like a big person sniffing their own armpit. The image of recoiling from your own post-workout stench locks in the meaning.
Quick recall
Sniff oneself after a big workout—absolutely stinking.

Details

The keyword for 臭 is stinking. This kanji refers to foul or unpleasant odors, conveying the sense of something that smells bad or reeks. It can also be used figuratively to describe something suspicious or dubious, much like the English expression "something smells fishy." The character broadly encompasses the concept of offensiveness to the nose and, by extension, to one's sensibilities.
On'yomi
しゅう
Kun'yomi
くさ.い、-くさ.い、にお.う、にお.い

Used in vocab