Denshi Jisho — Online Japanese dictionary

さらう to sweep away; to wash away; to dredge
Common word, Godan verb with u ending, Transitive verb 
しゅんせつ dredging
Noun, Suru verb 
渫機 しゅんせつき dredger
Noun 
渫船 しゅんせつせん dredger
Noun 
渫作業 しゅんせつさぎょう dredging operations
Noun 

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