silver dollar

noun
🔊/ˌsɪlvə ˈdɒlə(r)/
🔊/ˌsɪlvər ˈdɑːlər/
(North American English)
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  1. a large silver coin used in the past that was worth one dollar, sometimes used now to describe the size of something
    • a spider as big as a silver dollar像银元一样大的蜘蛛