Intense low‐frequency sound can severely attenuate sound of higher frequencies via spectral redistribution. On the other hand, intense high‐frequency sound does not appreciably alter a lower‐frequency sound field. An experiment is described wherein a 68‐kHz underwater sound beam was made to propagate collinearly with a 244‐kHz beam, demonstrating the absorption of sound by sound. The results are in good agreement with the theory of F. H. Fenlon [J. Acoust. Soc. Am. 51, 284–289 (1972)].