The phrase "basement flooding" means that water has leaked or entered into the lower level of a house or building, causing it to become wet or filled with water. Full definition
A simple leaky pipe could turn into a full blown basement flood before anyone notices if your home is sitting empty. (trustedchoice.com)
Ask the sellers or their agent if they have had basement flooding problems or mould or roof leaks, even if the leaks have been repaired. (homeownership.ca)
A tiny bathroom leak can grow into a massive basement flood before you ever realize there's a problem. (trustedchoice.com)