smell, to smell
齅 centers on the act of smelling: using the nose to detect odors. The meaning is straightforward and closely tied to the nose component.
齅 combines 鼻 (nose) with 臭 (smell, odor), directly expressing the idea of smelling. The character is a semantic compound.
The nose 鼻 on the left and the smell 臭 on the right come together: 齅 is the act of smelling with your nose.
For キュウ, imagine a strong smell making you say 'kyu!' as you wrinkle your nose: kyu -> キュウ, and the nose 鼻 detects the odor 臭.