rub rub /ˈrʌb/

noun

1. The act of rubbing or wiping  ( rub , wipe )
   the act of rubbing or wiping
    He gave the hood a quick rub
   he gave the hood a quick rub
   
2. An unforeseen obstacle  ( hang-up , hitch , rub , snag )
   an unforeseen obstacle
   

verb

1. () Move over something with pressure  ( rub )
   move over something with pressure
    Rub my hands
   rub my hands
    Rub oil into her skin
   rub oil into her skin
   
2. () Cause friction  ( chafe , fray , fret , rub , scratch )
   cause friction
    My sweater scratches
   my sweater scratches
   
3. Scrape or rub as if to relieve itching  ( rub , scratch , itch )
   scrape or rub as if to relieve itching
    Don't scratch your insect bites!
   Don't scratch your insect bites!