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valve
vamp
vampire
vampire bat
van

valve  (valves plural )
1  n-count A valve is a device attached to a pipe or a tube which controls the flow of air or liquid through the pipe or tube. 
2  n-count A valve is a small piece of tissue in your heart or in a vein which controls the flow of blood and keeps it flowing in one direction only. 
He also has problems with a heart valve.  
3 
 →  safety valve 

safety valve   (safety valves plural )
1  n-count A safety valve is a device which allows liquids or gases to escape from a machine when the pressure inside it becomes too great. 
Residents heard an enormous bang as a safety valve on the boiler failed.  
2  n-count A safety valve is something that allows you to release strong feelings without hurting yourself or others. 
...crying is a natural safety valve.  



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