"Un-water" is a term that means trying to get rid of water from places where we don't want it to be, like flooded areas or wet basements. Imagine your toy tub overflowing with water and making a big mess on the bathroom floor. To un-water this situation, you would use a bucket or a towel to remove the extra water and put it back into the tub. Similarly, when there is a big rainstorm or a flood, we use special equipment like pumps and sandbags to un-water the affected areas and protect buildings and homes from water damage. So, un-water means getting rid of water where we don't want it to avoid problems and keep things dry and safe.