单词	dam
释义	noun | verb damdam1 /dæm/ ●●○ noun [countable] Etymology ETYMOLOGYdam1 Origin: 1300-1400 Middle Dutch 1 a special wall built across a river, stream, etc. to stop the water from flowing, especially to make a lake or produce electricity:  the Hoover Dam in Nevada2[usually singular] technical the mother of a four-legged animal, especially a horse → sire noun | verb damdam2 verb (dammed, damming) [transitive] Verb Table VERB TABLE dam Simple Form Present I, you, we, they dam he, she, it dams Past I, you, he, she, it, we, they dammed Present perfect I, you, we, they have dammed he, she, it has dammed Past perfect I, you, he, she, it, we, they had dammed Future I, you, he, she, it, we, they will dam Future perfect I, you, he, she, it, we, they will have dammed Continuous Form Present I am damming he, she, it is damming you, we, they are damming Past I, he, she, it was damming you, we, they were damming Present perfect I, you, we, they have been damming he, she, it has been damming Past perfect I, you, he, she, it, we, they had been damming Future I, you, he, she, it, we, they will be damming Future perfect I, you, he, she, it, we, they will have been damming to stop the water in a river, stream, etc. from flowing by building a special wall across it:  The East Branch River was dammed in 1952.dam something ↔ up phrasal verb to make the water in a river, stream, etc. stop flowing by blocking it:  The landslide dammed up the river.
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