sore, aching, or tingling, usually due to fatigue or illness; same as 痠 suān

to hiss; the sharp sound of air being sucked between the teeth to show hesitation, thinking, or pain

(bound form) sick at heart; grieved; distressed, such as in 心酸 xīn​suān

to neigh (of a horse) or chirp (of an insect); the sound of such cries