specialize
spe‧cial‧ize
(also specialise British English) /ˈspeʃəlaɪz/ verb [intransitive]
specialize in
Simmons specialized in contract law.
spe‧cial‧ize
(also specialise British English) /ˈspeʃəlaɪz/ verb [intransitive] Word Family: noun: special, specialist, SPECIALITY/SPECIALTY, specialization, specialism; adjective: special, specialized; verb: specialize; adverb: specially
to limit all or most of your study, business etc to a particular subject or activityspecialize in