Here the spectators hummed.
Trial of the Regicides.
Formerly the habit of audiences was to express gratification by humming
and displeasure by hissing.
5. To have the sensation of a humming noise; as, my head hums, -- a
pathological condition.
Hum, v. t. 1. To sing with shut mouth; to murmur without articulation;
to mumble; as, to hum a tune.