rankle

Etymology

From Middle English ranklen, ranclen, from Old French rancler, räoncler, draoncler (“to ulcerate, to form a boil”), from Old French draoncle (“a boil”), from Latin dracunculus (“little serpent”), diminutive of Latin dracō (“serpent, dragon”).

verb

1. (transitive or intransitive) To cause irritation or deep bitterness.
   […] and the alliance which was dictated by sound policy, by family ties, and by just fear of England's sea power, was further assured to France by recent and still existing injuries that must continue to rankle with Spain. […] 1890, Alfred Thayer Mahan, chapter IX, in The Influence of Sea Power upon History
   1894, Ivan Dexter, Talmud: A Strange Narrative of Central Australia, published in serial form in Port Adelaide News and Lefevre's Peninsula Advertiser (SA), Chapter XX, http://gutenberg.net.au/ebooks16/1600641.txt I stood trembling with agony for the spear was rankling in the wound.
   Contrary to the biblical injunction, I have allowed many suns to set on a quarrel I have harboured against you, but I must not allow the old year to expire without disburdening myself of what is rankling in my breast against you. 1942-12-31, Mahatma Gandhi, “Letter on New Year’s Eve: May the New Year bring peace to us [Letter to Lord Linlithgow]”, in R. L. Khipple, editor, Famous Letters of Mahatma Gandhi, Lahore: The Indian Printing Works, published 1947, page 131
   Liam hadn't meant for that last part to slip out. Allie might think it pretty pathetic that he'd remembered that comment from the first night they met, but it had rankled him then and, to some degree, it rankled him now. 2014, Emily Dalton, A Baby for Lord Roderick
   What most rankles me about the term is how casually it is being applied to schools—temples of learning—and especially to children. 2022-06-14, John McWhorter, “Republicans Want to ‘Harden’ Schools. That’s an Awful Euphemism.”, in The New York Times, →ISSN
2. (intransitive) To fester.
   a splinter rankles in the flesh
   a malady that burns and rankles inward 1707, Nicholas Rowe, The Royal Convert
   Now blotches rankling, coloured gay and grim, / Now patches where some leanness of the soil's / Broke into moss or substances like boils; 1855, Robert Browning, Childe Roland to the Dark Tower Came, section XXVI

noun

1. (rare) A festering, embittering object or condition, either mental, or a physical sore or ulcer.
   To this the Prince appeared to acquiesce; but I saw it did not please, and left a rankle in his mind. 1795, James Harris, 1st Earl of Malmesbury, Diaries and Correspondence of James Harris, First Earl of Malmesbury., R. Bentley, published 1844, page 220