swear down verb 2exclamation 1forms 4 verb2 •To promise that something is (not) true. •To promise; swear; give one's word. exclamation1 •(Northern-England, slang) I promise; no lie.“Swear down. He's found religion. Well, that's what I've heard anyway.” — 2011 formsswore down · sworn down · swearing down · swears down
