Undulate

At the end of a gestation period usually lasting from two to four weeks, the pregnant male’s abdominal area begins to undulate rhythmically, and strong muscular contractions eject from a few dozen to as many as 1,000 fully formed baby seahorses into the surrounding water.

Breath vocalized, i.e., vibrated and undulated.

Come lovely and soothing death, / Undulate round the world, serenely arriving, arriving, / In the day, in the night, to all, to each, / Sooner or later delicate death.