{coord. conj.} Used to emphasize that two or more things are talked about. * /Both Frank and Mary were at the party./ * /Millie is both a good swimmer and a good cook./ * /In the program tonight Mary will both sing and dance./ * /The frog can move quickly both on land and in the water./ Compare: AS WELL AS. Contrast EITHER OR.
BOTH --- AND
Meaning of BOTH --- AND in English
Dictionary of English idioms . Словарь английских идиом. 2012