Undersong
Pronunciation : Un"der*song`
Part of Speech : n.
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913