1) keystoneNoun
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The central building block at the top of an arch or vault | محراب کے سِرے کا پَتھر ۔ |
2) keystoneNoun
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A central cohesive source of support and stability the keystone of campaign reform was the ban on soft money | کَليدی پَتھَر ۔ بُنيادی پَتھر ۔ |