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Phrase(s): stick to one’s guns
Fig. to remain firm in one’s convictions; to stand up for one’s rights. (Fig. on a soldier remaining in place to fire a gun even when all appears to be lost.) • I’ll stick to my guns on this matter. I’m sure I’m right. • Bob can be persuaded to do it our way. He probably won’t stick to his guns on this point.
McGrawhill's American Idioms And Phrasal Verbs