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general::
Phrase(s): fold something into something 1. [and] fold something in
to blend something, such as eggs, into batter. (See also cut something into something.) • Carefully, the chef folded the eggs into the other ingredients. • The chef folded in the eggs. 2. to make an object by folding something, such as paper or cloth. • He folded the paper into a little bird. • Wally can fold a sheet of paper into an airplane that flies.
McGrawhill's American Idioms And Phrasal Verbs