warble

Definition

To modulate a tone's frequency.

Etymology

Perhaps onomatopoeic.

Example Sentences

• "Her voice more sweet than warbling sound, Tho’ sung by nightingale or lark, Her eyes such lustre dart around, Compar’d to them the sun is dark."
• "In the swamp in secluded recesses, / A shy and hidden bird is warbling a song."
• "touch the warbled string"