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yestermorn

adverb
yes·​ter·​morn | \ˈyestər¦mȯ(ə)rn\
variants: or yestermorning \ -​ȯrniŋ \

Definition of yestermorn 

(Entry 1 of 2)

archaic

: on the morning of yesterday

yestermorn

noun
\"\
variants: or yestermorning \ " \

Definition of yestermorn (Entry 2 of 2)

archaic

: the morning of yesterday : the morning of the day last past

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History and Etymology for yestermorn

Adverb

yester- (as in yesterday) + morn or morning

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