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1. — And is used between repeated words to show continuation or emphasis.
* /When the children saw the beautiful Christmas tree they looked and looked./* /Old Mr, Bryan has known Grandfather for years and years, since they were boys./* /Billy dived to the bottom of the lake again and again, looking for the lost watch./* /Everyone wished the speaker would stop, but he talked on and on./
Compare: THROUGH AND THROUGH.
2. — When "and" is used between words with opposite meaning, it often emphasizes how much you mean.
* /Mr. Jones worked early and late to earn enough to live./* /The parents hunted high and low for the lost child./
Compare: DAY AND NIGHT, FROM -- TO, INSIDE AND OUT.