"Keep up the work" really isn't a common idiom, so I don't have another idiom that means the same. Sometimes you hear "keep up the good work," which means to continue doing a good job, to keep on with the quality you're doing now. However, I still can't think of another idiomatic expression that means the same thing...
"Keep up the good work" means to continue doing well and maintain a high standard of performance or behavior. It is an encouraging phrase used to motivate someone to persevere and maintain their positive momentum.
to support
Hang in there!
The idiomatic expression for "advanced in years" is "getting on in age."
It means tired of, frustrated with, and starting to get angry.
it means you are not as fast as somebody else
It means that you can be easily be woken up by any small sound.
"Zippity split" is an idiomatic expression meaning "hurry up," "right away," or "very quickly."
Burned up means that a person is totally exhausted. A person can also be burned up if they are very angry with someone.
"Zip your lips" is an idiomatic expression that means to stay quiet or not to speak. It is often used when someone wants another person to stop talking or to keep a secret.
The idiomatic expression "to slack up" means to become less strict or diligent in one's work or efforts, to relax or ease up on something. It implies a decrease in effort or intensity.
ad lib is short for ad libitum which means 'as desired", implying that the selection or topic is up to the desire of the speaker