keep on (
http://definr.com/keep on)
v : allow to remain in a place or position; "We cannot continue
several servants any longer"; "She retains a lawyer";
"The family's fortune waned and they could not keep their
household staff"; "Our grant has run out and we cannot
keep you on"; "We kept the work going as long as we
could" [syn:
retain,
continue,
keep,
keep going]