What does "bittersweet nightshade" mean?

poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America

Bittersweet nightshade

Common synonyms include: bittersweet, climbing nightshade, deadly nightshade, poisonous nightshade, solanum dulcamara, woody nightshade.

Rare ·Advanced level

Noun

1
poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America wordnet