bitter apple
From Wiktionary, the free dictionary
Noun
bitter apple (countable and uncountable, plural bitter apples)
- Citrullus colocynthis, a vine that bears a hard, bitter fruit.
- A bitter preparation applied to an object to discourage dogs from chewing on it.
Synonyms
- (Citrullus colocynthis): colocynth, bitter cucumber, desert gourd, egusi, vine of Sodom, wild gourd
Further reading
bitter apple on Wikipedia.Wikipedia 
Citrullus colocynthis on Wikispecies.Wikispecies 
Citrullus colocynthis on Wikimedia Commons.Wikimedia Commons - “bitter apple”, in OneLook Dictionary Search.
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