keep up
Verb
Meaning
keep in safety and protect from harm, decay, loss, or destruction
keep informed
prevent from going to bed at night
maintain a required pace or level
lengthen or extend in duration or space
Source: WordNetSynonyms
Antonyms
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Examples
No matter how cynical you become, it's never enough to keep up.
Never try to impress a woman, because if you do she'll expect you to keep up the standard for the rest of your life.
It's no good trying to keep up old friendships. It's painful for both sides. The fact is, one grows out of people, and the only thing is to face it.
It takes good memory to keep up a lie.
Never keep up with the Joneses. Drag them down to your level.
Keep up with the times, don't stay in the dark.