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Topic: PLANTS

Language: Old English
Origin:

thorn

noun
     
thorn
1 [countable]HBP a sharp point that grows on the stem of a plant such as a rose
2 [uncountable and countable]HBP a bush or tree that has thorns:
a long, low hedge of thorns
3

a thorn in somebody's side

someone or something that annoys you or causes problems for a long period of time:
He's been a thorn in the side of the party leadership for years.
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