Note to King Lear, 1.1.280

King Lear,
Act 1, Scene 1, line 280
Time shall unfold what plighted cunning hides: i.e., time will reveal what is now concealed under cunning folds. —The word "plighted" means "pleated" or "enfolded," but it also means "promised" or "vowed," as in the phrase "plighted troth." Both meanings are applicable to Goneril's hypocritical professions of affection for her father.