单词	aggrade
释义	aggrade verb ag·​grade ə-ˈgrād, a- -ed/-ing/-s transitive verb : to fill with detrital material silt has aggraded the river bed and waterlogged it for a hundred miles Erna Fergusson intransitive verb : to build up by aggradation meltwater streams were aggrading beyond the moraines R. J. Lougee Word History Etymology ad- + -grade (as in degrade entry 1) First Known Use 1893, in the meaning defined at transitive sense
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