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third-person singular simple present horns in, present participle horning in, simple past and past participle horned in
(slang) To intrude or butt in (on something). quotations
J isn't thrilled by the idea—says he's afraid she'll be taking up my time and horning in on our time together.
1977-1980, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure