line of country
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(one's) line of country
One's preferred area of knowledge or expertise; a subject one is very skilled in, knows much about, or enjoys greatly. I worked in IT for a few years—it paid well, but it wasn't really my line of country. I won't comment, as speculating on political motivations is not my line of country.
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line of countrya subject about which a person is skilled or knowledgeable. British
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