to feel sad

a salt or ester of sulfuric acid containing the sulfate ion (SO4 2-)

hydrochloric acid HCl

to ache; to be sore

bitter, sad, or full of suffering (usually regarding life experiences)

a salt or ester of carbonic acid

pickled vegetables, especially Chinese cabbage

having a somewhat sour taste; describing a mild or pleasant sourness.

a salt or ester of acetic acid

colloquial abbreviation for a nucleic acid test (NAT), often referring to a COVID-19 PCR test

the joys and sorrows of life; all kinds of life experiences

acetic acid (CH3COOH) or ethanoic acid

sharp and caustic in speech or manner; bitingly critical or sarcastic

The simplest carboxylic acid (HCOOH), also known as methanoic acid, occurring naturally in ants and used in various industrial processes.

sour and sweet

a sense of grievance or internal pain resulting from suffering or hardship

unpresentable or stingy in manner, particularly regarding gifts, hospitality, or rewards

glutamic acid (Glu), an amino acid

oxalic acid C2H2O4

lactic acid bacteria

lysine (Lys), an essential amino acid

phosphate (salt or ester of phosphoric acid)

tyrosine (Tyr), an amino acid

benzoic acid C6H5COOH

arginine (Arg), an essential amino acid

to experience a sensation of soreness or fatigue in muscles

aching and weary

having a sour and astringent or puckery taste

acrylic acid C3H4O2

sour date (Ziziphus jujuba var. spinosa)

a type of preserved plum, often used in drinks or snacks, known for its sour taste.

to feel sore or experience a dull pain, especially in the muscles or joints due to fatigue or illness