Main Entry: keep up

Function: verb

Date: 15th century

transitive verb

: to persist or persevere in <kept up the good work>; also : maintain, sustain <keep standards up>intransitive verb 1 : to keep adequately informed or up-to-date <keep up on international affairs>
2 : to continue without interruption <rain kept up all night>
3 : to maintain contact or relations with <keep up with old friends>