| 单词 | keystone |
| 释义 | keystone /kee"stohn'/, n. 1. the wedge-shaped piece at the summit of an arch, regarded as holding the other pieces in place. 2. something on which associated things depend: the keystone of one's philosophy. 3. Also called keystone sack. Baseball Slang. See second base (def. 1). [1630-40; KEY1 + STONE] Syn. 2. basis, principle, foundation, linchpin. |
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