to lurk; to be hidden; to be concealed; to lie dormant; to be latent
to lower one's voice; to speak with a hushed voice
to hold one's breath; to bate one's breath
to hide; to conceal; to lower volume (of a sound or one's voice) so as not to be heard; to become quiet and inconspicuous
to quieten down; to fall silent; to cease activities; to become inactive; to lie low
to hide; to lie motionless in hiding