mud·flat /ˈmʌdflæt/ noun [countableC usually plural]
1.DNAREAan area of muddy land that is covered by the sea when it comes up at high tide and uncovered when it goes down at low tide 〔落潮时露出、涨潮时淹没的〕泥滩,潮泥滩
2.American EnglishAmEDN the muddy bottom of a drylake 〔湖泊干涸后的〕泥床,泥底