specialise
verb
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evolve so as to lead to a new species or develop in a way most suited to the environmentdifferentiate
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become more focus on an area of activity or field of study“They specialize in Near Eastern history.”narrow
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suit to a special purpose“specialize one's research”
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be specific aboutspecifyparticulariseparticularize
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devote oneself to a special area of work“They specialize in honey bees.”