n a hole for the escape of gas or air
n external opening of urinary or genital system of a lower vertebrate
n a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
n a slit in a garment (as in the back seam of a jacket)
n activity that frees or expresses creative energy or emotion
v give expression or utterance to
v expose to cool or cold air so as to cool or freshen