Sim·mer v. i. [imp. & p. p. Simmered p. pr. & vb. n. Simmering.] To boil gently, or with a gentle hissing; to begin to boil.
I simmer as liquor doth on the fire before it beginneth to boil. --Palsgrave.
simmering
n : cooking in a boiling liquid [syn: boiling, stewing]