1. 
   Tanking
   a waterproof skin applied to the walls and floors of basements to prevent the penetration of groundwater.
   Found op http://www.encyclo.co.uk/local/20935
   
   
2. 
   Tanking
   The coating of a section of a wall with an impervious material to prevent water penetrating it.
   Found op http://www.maintainyourchurch.org.uk/ToolkitModules/Toolkit1Glossary/tabid/
   
   
3. 
   tanking
   1) Doing horribly
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/tanking/1
   
   

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