persist in (doing something)

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persist in (doing something)

To continue pursuing some action with steadfast or obstinate tenacity. Why do you persist in bothering your sister like that? Tommy has been persisting in undermining my authority ever since he was given that promotion.
See also: persist

persist in doing something

to continue doing something. John persists in thinking that he's always right. Tom persists in demanding that I agree to his terms.
See also: persist