1. To flow or stream out (of or from something) and onto a person or thing. Water began pouring out onto the ground from the spot where I hit the pipe with my shovel. Ice-cold air poured out onto us through the crack in the window pane.

2. To cause a liquid or loose substance to flow or stream out (of or from something) and onto a person or thing. In this usage, a noun or pronoun is used either before or after "out." I poured out the soapy water on the road after I was done washing the car. Stop pouring water out onto me, Sarah, or I'll tell Mom!

3. Of people, to leave the indoors and throng together in some open, outdoor space in great numbers and all at once. People poured out onto the streets to protest the not-guilty verdict. It rains so often here that anytime the sun shows up, people pour out onto the beach to soak it up while it lasts.