keep up

Meaning

1. To maintain; to preserve; to prevent from deteriorating or falling.
2. To continue with (work, etc).
3. To stay even or ahead.
4. To ensure that one remains well-informed about something.
5. To prevent someone from going to bed or to sleep
6. (obsolete) To use capital letters as much as reasonable.

Synonyms

maintain

preserve

keep

sustain

continue

retain

hold up

be up

conserve

bear up

keep on

remain up

stay up

hold

prolong

go on

keep abreast

support life

resume

come up with

hold on

extend

follow

catch up

stop up

hang out

support

keep going

carry on

uphold

pickle

press on

proceed

procrastinate

prop

protect

ride

run on

save

second

2nd

spin

spin off

spin out

stall

stay on

stretch

supply

keep in good condition

move on

give assistance to

get up with

spunk up

have self-control

plow ahead

assist

be equals

bear on

brace up

buck up

care

cheer up

cherish

chirk up

drag one’s feet

drag one’s heels

draw out

drive

endorse

favour

go ahead

go along

hang in

hang on

help

hold off

hold out

hold over

keep pace with

keep up with

last

last out

lay away

match

perk up

perpetuate

Etymology

Inherited from Middle English: kepen up

In summary

From Middle English kepen up (“to perpetuate, maintain, preserve”), equivalent to keep + up.