gag1
  
  n.
   - a piece of cloth put in or over a person's mouth to prevent them from speaking.
 - a device for keeping the patient's mouth open during a dental or surgical operation.
 - a restriction on free speech.
 
v.
 (gags, gagging, gagged)
  - put a gag on. 
▸prevent from speaking freely.
 - choke or retch.
 
 
  Etymology
  ME: perh. rel. to ON gagháls ‘with the neck thrown back’, or imitative of a person choking.
 
  
    
gag2
  
  n.
 a joke or funny story, especially one forming part of a comedian's act.
v.
 tell jokes.
 
  Etymology
  C19 (orig. theatrical sl.): of unknown origin.