I.out [美 aʊt, 英 aʊt]副out often appears as the second element of certain verb structures in English (come out, keep out, knock out, etc). For translations, see the relevant verb entry (come, keep, knock, etc).
He let out a thunderous symphony of shrieks followed by a fit of laughter that resounded through the city mobilizing the still dust caught in the pestilential air.
Three other shoppers attended to the "possessed" woman by holding her still, but the woman let out a blood-curdling yell, and the shoppers stepped back.