From the French word for whispering: "chuchoter". This is a variant of simultaneous interpreting: the interpreter stands or sits next to the listener(s), translating simultaneously in a low voice.
What is chuchotage (whispering)?
This type of translation can be accomplished without any technological assistance (unlike simultaneous), but can only be employed when the listeners are few in number (generally not more than two or three). Moreover, because of the effort of whispering the translation, keeping one’s voice artificially low, often in a situation where the acoustics are less than perfect, an interpreter can only translate in chuchotage mode for relatively brief periods.