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half-and-half

noun

something which consists of half of one thing and half of another thing; esp.,
  1. ☆ a mixture of equal parts of milk and cream
  2. Chiefly Brit. a mixture of equal parts of porter and ale or of beer and stout

adjective

combining two things equally

adverb

in two equal parts

See half-and-half in American Heritage Dictionary 4

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