noun
imitated animal cry; feigned sound
Refers to a sound made to mimic an animal's cry, often with the implication of deception or pretense. The 'lie' gloss reflects the broader idea of a false or pretended sound.
彼は空音を使って鳥をおびき寄せた。
He used an imitated bird call to lure the bird.
その声は空音で、本当に泣いているわけではなかった。
That cry was feigned; she wasn't really crying.
空言 means a lie or falsehood in speech, while 空音 specifically refers to a feigned sound or imitated animal cry.
Compound of 空 (そら, 'empty, false') and 音 (ね, 'sound'). The reading そらね follows standard rendaku patterns.