specialize in

specialize in (something)

To have specific training, education, proficiency, or experience in one particular subject, topic, field, etc. My bachelor's degree was in English literature overall, but I specialized in Victorian literature for my master's degree. Our company specializes in building networking strategies for small businesses.
See also: specialize
Farlex Dictionary of Idioms.

specialize in something

to limit oneself to or be specially trained to practice one particular thing. I specialize in tropical medicine. What do you specialize in?
See also: specialize
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • specialize
  • specialize in (something)
  • be another matter
  • be another thing
  • be another/a different matter
  • (one's) face fits
  • (Someone or something) called, they want their (something) back!
  • a rotten apple spoils the (whole) bushel
  • bushel
  • one rotten apple spoils the (whole) bushel