The practice of relaxing the mouth to become free from mind chatter :
madhyajihve sphāritāsye madhye nikṣipya cetanām |
hoccāraṃ manasā kurvaṃs tataḥ śānte pralīyate || 81 ||
"One should focus on the tongue
spread in the middle (of the open mouth),
saying a mental 'hhh...".
Then one will dissolve in peace."
