1. To remove something out of something else with vigorous scrubbing, especially by using a very abrasive brush or cleaning pad. A noun or pronoun can be used between "scour" and "out." I spent nearly an hour trying to scour the dried paint out of the cups, but I just couldn't get it all out. Take this wire brush and scour out the rust from the rims of the wheels.

2. To clean the inside of something with vigorous scrubbing, especially by using a very abrasive brush or cleaning pad. A noun or pronoun can be used between "scour" and "out." Let the saucepans soak overnight before you try to scour them out—it should make it easier. We should probably scour out the entire length of pipe to ensure the water can flow properly.

3. To search extensively or exhaustively for something. A noun or pronoun can be used between "scour" and "out." I'm a vegan, so I spend half my time shopping trying to scour out the symbol telling me whether food is vegan friendly or not. I've been scouring a location out for our photo shoot.