Le mot anglais pour aigre est
sour

Définition en anglais

aigre
1. adj. sharp, sour, acid
cerises aigres - sour cherries
2. adj. shrill (voice); biting (wind etc.)
la voix aigre des cornemuses - the shrill voice of the bagpipes

sour	©
1. adj. Aigre, sur, revêche.
2. n. Gout aigre.
3. n. Boisson d'un gout aigre. Tout cocktail contenant du citron.
4. v. (Transitif) Acidifier, aigrir, rendre acide.
5. v. (Intransitif) Surir, s'acidifier, s'aigrir, devenir acide.
The milk soured because it wasn't put back in the refrigerator.
Le lait a suri parce qu'il n'a pas été remis dans le réfrigérateur.
(figuré) He soon soured on the relationship when he discovered how fickle she was.
Il s'aigrit bientôt quant à leur relation quand il découvrit combien elle était volage.

sour	©
1. adj. Having an acidic, sharp or tangy taste.
Lemons have a sour taste.
2. adj. Made rancid by fermentation, etc.
sour milk
3. adj. Tasting or smelling rancid.
sour stink
4. adj. Peevish or bad-tempered.
He gave me a sour look.
5. adj. (of soil) Excessively acidic and thus infertile.
sour land
a sour marsh
6. adj. (of petroleum) Containing excess sulfur.
7. adj. Unfortunate or unfavorable.
8. adj. (music) Off-pitch, out of tune.
9. n. The sensation of a sour taste.
10. n. A drink made with whiskey, lemon or lime juice and sugar.
11. n. (by extension) Any cocktail containing lemon or lime juice.
12. n. A sour or acid substance; whatever produces a painful effect.
13. v. To make sour.
Too much lemon juice will sour the recipe.
14. v. (intransitive) To become sour.
15. v. To spoil or mar; to make disenchanted.
16. v. (intransitive) To become disenchanted.
We broke up after our relationship soured.
17. v. To make (soil) cold and unproductive.
18. v. To macerate (lime) and render it fit for plaster or mortar.

acid	©
1. adj. Sour, sharp, or biting to the taste; tart; having the taste of vinegar.
acid fruits or liquors
2. adj. (figuratively) Sour-tempered.
3. adj. Of or pertaining to an acid; acidic.
4. adj. (music) Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.
5. n. A sour substance.
6. n. (chemistry) Any of several classes of compound having the following properties:
7. n. Any of a class of water-soluble compounds, having sour taste, that turn blue litmus red, and react with some metals to liberate hydrogen, and with base
8. n. Any compound that easily donates protons; a Brønsted acid
9. n. Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid
10. n. (slang) lysergic acid diethylamide (LSD)