keep up on

:  to retain in one's possession or power

:  to refrain from granting, giving, or allowing

:  to have in control

:  the means or provisions by which one is kept

:  one that keeps or protects: such as

:  fortress, castle

:  in or into a higher position or level

:  away from the center of the earth

:  from beneath the ground or water to the surface

:  risen above the horizon

:  standing

:  being out of bed

: used as a function word to indicate motion to or toward or situation at a higher point of

:  up into or in the

:  in a direction regarded as being toward or near the upper end or part of

:  one in a high or advantageous position

:  an upward slope

:  a period or state of prosperity or success

:  to rise from a lying or sitting position

:  to move upward :  ascend

: used with and and another verb to indicate that the action of the following verb was either surprisingly or abruptly initiated