get at is a verb meaning "reach or gain access to". It carries 3 recorded senses.
influence by corruption
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”
Definitions, synonyms and semantic relations for get at come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.