Definition of dam verb from the Oxford Advanced Learner's Dictionary

 

dam

 verb
verb
BrE BrE//dæm//
 
; NAmE NAmE//dæm//
 
Verb Forms present simple I / you / we / they dam
BrE BrE//dæm//
 
; NAmE NAmE//dæm//
 
he / she / it dams
BrE BrE//dæmz//
 
; NAmE NAmE//dæmz//
 
past simple dammed
BrE BrE//dæmd//
 
; NAmE NAmE//dæmd//
 
past participle dammed
BrE BrE//dæmd//
 
; NAmE NAmE//dæmd//
 
-ing form damming
BrE BrE//ˈdæmɪŋ//
 
; NAmE NAmE//ˈdæmɪŋ//
 
 
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(damming, dammed) dam something (up) to build a dam across a river, especially in order to make an artificial lake for use as a water supply, etc. plans to dam Colorado’s South Platte River Locals strongly opposed plans to dam the river. They formed artificial lakes by damming up a natural stream. Word Originverb Middle English: from Middle Low German or Middle Dutch; related to Dutch dam and German Damm, also to Old English fordemman ‘close up’.
See the Oxford Advanced American Dictionary entry: dam