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| a gadget; dingus; thingumbob. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
"[I]t appears from the earliest quotations ... that the brow in question was that of the beater, not of the beaten party; but it is not evident whether the meaning was 'to beat with one's (frowning) brows,' or 'to beat (?lower) one's brows at.'" [OED]Related: Browbeaten; browbeating.