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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
again and again
Repeatedly, often, as in I've told you again and again, don't turn up the heat. This idiom uses repetition for the purpose of emphasis (as does its synonym, over and over). Shakespeare used it in Othello (1:3): "I have told thee often, and I retell thee again and again." [c. 1600]