1. 
   shut off
   [v] - stem the flow of 2. [v] - isolate or separate 3. [v] - block off the passage through
   Found op http://www.webdictionary.co.uk/definition.php?query=shut%20off
   
   
2. 
   Shutoff
   The surfaces where the A-side and B-side of the mould contact. The shutoff meets the part at the parting line
   Found op http://www.protomold.co.uk/Glossary.xhtml
   
   
3. 
   shutoff
   1) Plumbing control 2) Stop, as electric service
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/shutoff/1
   
   
4. 
   shutsoff
   1) Stops, as electricity
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/shutsoff/1
   
   

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