S: (v) fold (fold%2:30:00::) (incorporate a food ingredient into a mixture by repeatedly turning it over without stirring or beating) "Fold the egg whites into the batter"
S: (v) build in (build_in%2:30:00::) (make something an integral part of something else) "we can build in a special clause to make the contract better for you"
S: (v) heterodyne (heterodyne%2:35:00::) (combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two)