con sordina

under one's breath

Barbieri hizo en ella algunas aportaciones orquestales que fueron muy valoradas, como la utilización de trombones con sordina, una novedad en España.	Barbieri made some orchestral innovations in this numbers that were very well received, such as muted trombones, a novelty in Spain.
El solo de clarinete se eleva por encima de los bronces con sordina.	The clarinet solo soars over the muted brass.
La melodía capturada por el dúo de erhu, un instrumento chino de dos cuerdas, y una trompeta con sordina evoca la elegancia de esas mujeres.	The noblewomen's elegance was evoked through a melody captured by a duet of an erhu, a two-stringed instrument, and a muted trumpet.
El movimiento comienza con un distante repique de campanas enganchado con un ostinato premonitorio en cuerdas graves, que están unidos por instrumentos de viento y de metal con sordina.	The movement begins with the distant tolling of chimes coupled with a foreboding ostinato in the lower strings, which are joined by the winds and muted brass.
Los ladrones hablaban con sordina para no despertar a nadie.	The thieves spoke in a whisper so no one would wake up.
Se mudaron a su nuevo hogar con sordina para que ningún vecino se enterara.	They moved to their new home on the quiet so none of the neighbors would notice.
Hubo reuniones entre los dos líderes, pero con sordina, para que no trascendieran a la prensa.	There were meetings between the two leaders, but on the sly, so they wouldn't leak out to the press.