Meaning of bittersweet

Definition of bittersweet

(adj) tinged with sadness; "a movie with a bittersweet ending"
having a taste that is a mixture of bitterness and sweetness
(noun) poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America
twining shrub of North America having yellow capsules enclosing scarlet seeds

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