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Webster 1913 Edition
Undersong
Un′der-songˊ
,Noun.
1.
The burden of a song; the chorus; the refrain.
Dryden.
2.
Accompanying strain; subordinate and underlying meaning; accompaniment; undertone.
In the very [poetry] there often an
undersong
of sense which none beside the poetic mind . . . can comprehend. Landor.
Webster 1828 Edition
Undersong
UN'DERSONG
,Noun.
Menalcas shall sustain his undersong.