It's not an idiom, you just have to know the definitions of the words.
Fits: bursts of frenzied activity
Starts: beginnings
It means that whatever it was went along in bursts of energy sometimes and sometimes stopped and started over.
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.
The expression is "fits and starts."
There are no English idioms that start with X
I cannot find an idiom that starts off "she cried tears." When you cry, you cry tears, so that would not be a good idiom anyway.
The cast of Fits and Starts of Restlessness - 2012 includes: Ron Moody
It is not an idiom, it means your nose is itching.
It's not really an idiom. It means "what are you thinking about."
RFP is not an idiom. It's an abbreviation.
"Sieve" is not an idiom. See the related link.
It's not an idiom. It means the tip of your nostril.
idiom means expression like a page in a book
The mineral zinc.