quiesce

WORDNET DICTIONARY

quiesce(v = verb.perception) hush, pipe down, quiet, quiet down, quieten - become quiet or quieter; "The audience fell silent when the speaker entered"

is one way to change intensity

Derived form adjective quiescent₃

Sample sentences:
Something ----s
Somebody ----s

quiesce, v. i. [L. quiescere, akin to quies rest, quiet. See Quiet, a. & n.].

To be silent, as a letter; to have no sound. M. Stuart. [1913 Webster]