(tr) to maintain (prices, one's morale) at the present level
(intr) to maintain a pace or rate set by another
(intr often foll by with) to remain informed: to keep up with technological developments
(tr) to maintain in good condition
(tr) to hinder (a person) from going to bed at night: the excitement kept the children up well past their bedtime
keep it up to continue a good performance
keep one's chin up to keep cheerful under difficult circumstances
keep one's end up to maintain one's stance or position against opposition or misfortune
keep up with to remain in contact with, esp by letter
keep up with the Joneses informal to compete with one's neighbours in material possessions, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use keep up in a sentence
Detention facilities would not necessarily have to keep up with U.S. prison standards.
“The most helpful thing is to try to keep up everyday activities,” says Dr. Rohan.
During a rebel attack, she left her family after being unable to keep up.
But she says students also have strong motivators to keep up with the classes.
So, people sped by the models less out of puritanical deference to the naked bodies, but to keep up their steely reputations.
There cannot be many persons in the world who keep up with the whole range of musical literature as he does.Music-Study in Germany | Amy Fay
By bringing men over from the Asiatic side and from Adrianople the Turks seem to be able to keep up their strength.Gallipoli Diary, Volume I | Ian Hamilton
It was directed to Mr. Carr, and said as plainly as look could say, "Don't undeceive her; keep up the delusion."Elster's Folly | Mrs. Henry Wood
The engine did more work while the steam lasted, but the boiler could not keep up the demand.Life of Richard Trevithick, Volume II (of 2) | Francis Trevithick
Here was one cause of his disinclination to meet his wife—having to keep up the farce of Dr. Ashton's action.Elster's Folly | Mrs. Henry Wood
Other Idioms and Phrases with keep up
Also, keep up with. Proceed at the same pace, continue alongside another, as in We try to keep up with the times. [First half of 1600s] This usage, also put as keep pace, appears in the phrase keeping up with the Joneses, which was coined in 1913 by cartoonist Arthur R. Momand for the title of a series in the New York Globe. It means “trying to match the lifestyle of one's more affluent neighbors or acquaintances.” For example, Their buying a new van is just another attempt to keep up with the Joneses.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.