Noun line of business has 2 senses
  1. line, product line, line of products, line of merchandise, business line, line of business - a particular kind of product or merchandise; "a nice line of shoes"
    --1 is a kind of merchandise, wares, product
    --1 has parts: top of the line
    --1 has particulars: sideline
  2. field, field of operation, line of business - a particular kind of commercial enterprise; "they are outstanding in their field"
    --2 is a kind of commercial enterprise, business enterprise, business
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