adjective

sour

sour, tart, bad-tempered, spoiled

This lemon is very sour.

This lemon is very sour.

The milk has gone sour.

The milk has gone sour.

He gave me a sour look.

He gave me a sour look.

((noun)) is sour This lemon is very sour.

a sour ((noun)) He gave me a sour look.

Synonyms: tart, acidic; Antonyms: sweet, pleasant

From Old English 'sūr'. Related to German 'sauer'.

Imagine sucking on a lemon and your face puckering up – that's a 'sour' face for a 'sour' taste.

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