timer : Idioms & Phrases
egg timer
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       noun a sandglass that runs for three minutes; used to time the boiling of eggs
        
      
 
WordNet
old-timer
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       noun an experienced person who has been through many battles; someone who has given long service
       
       
old stager; warhorse; veteran; oldtimer; old hand; stager.
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       noun an elderly man
       
       
old geezer; antique; gaffer; oldtimer.
 
WordNet
part-timer
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       noun someone who works less than the customary or standard time
        
      
 
WordNet
two-timer
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       noun someone who deceives a lover or spouse by carrying on a sexual relationship with somebody else
        
      
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       noun a person who says one thing and does another
       
       
double-crosser; traitor; betrayer; double-dealer.