1. Having a sharp biting taste.
2. One of the four basic taste sensations; like the taste of vinegar or lemons.
3. Smelling of fermentation or staleness; SYN. rancid.

1. A liquor (especially whiskey or gin) mixed with lemon or lime juice and sugar.
2. The taste experience when vinegar or lemon juice is taken into the mouth; SYN. sourness, tartness.

ETYM as. soerian to sour, to become sour.
1. To go sour or spoil; SYN. turn, ferment.
2. To make sour or more sour; SYN. acidify, acidulate, acetify.