A rushing or bursting forth; a quick issue; a sudden eruption; specifically, an issuing of troops from a place besieged to attack the besiegers; a sortie
If someone sallies forth or sallies somewhere, they go out into a rather difficult, dangerous, or unpleasant situation in a brave or confident way. worrying about her when she sallies forth on her first date Tamara would sally out on bitterly cold nights. Sally is also a noun. their first sallies outside the student world. sallied sallying sallies sally forth to go out in order to do something, especially something that you expect to be difficult or dangerous - often used humorously