aggrade

verb
ag·grade | \ ə-ˈgrād , a- \
-ed/-ing/-s

Definition of aggrade 

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

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First Known Use of aggrade

1893, in the meaning defined at transitive sense

History and Etymology for aggrade

ad- + -grade (as in degrade entry 1)

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The first known use of aggrade was in 1893

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