A jack-in-the-box comes up when you release the lid.
compromise
The prefix that fits the definition of backward or back is "re-".
"Frivolous" fits the definition of incapable of serious thought.
The prefix that fits the definition of pseudoscience is "pseudo-", which means false or not genuine.
The cast of Fits and Starts of Restlessness - 2012 includes: Ron Moody
Yes, Panama fits the definition of an isthmus.
Yes, it fits the definition
Para
I think you mis-heard this. I've never heard of any such idiom. There is something called "fits and starts," that means moving in a jerky fashion, however. Perhaps that's what you heard.
Para is the prefix best fitting the definition of beside.
Guillotine.
a sweeping a floor