get at in WordNet English dictionary

1. reach or gain access to
   "How does one access the attic in this house?"; "I cannot get to the T.V. antenna, even if I climb on the roof"
   access  get at 
   
2. cause annoyance in; disturb, especially by minor irritations
   "Mosquitoes buzzing in my ear really bothers me"; "It irritates me that she never closes the door after she leaves"
   annoy  rag  get to  bother  get at  irritate  rile  nark  nettle  gravel  vex  chafe  devil 
   
3. influence by corruption
   get at 
   

get at in English Wiktionary