if a lot is riding on someone, they have a lot of pressure or a burden. I think the expression is a gambling term. One might say that a lot is riding on a big bet.
Perhaps, it came from betting on horses where a lot is literally riding on a horse if one has placed a big bet on him.
a full schedule; a lot to do
To be in the spotlight is to be the focus of a lot of attention.
It means talk a lot - a whole lot!
a lot of snow
Old stagecoaches had two people sitting on top of the carriage. One was the driver, the other carried a shotgun to defend against Indians and bandits. Riding beside the driver is riding shotgun.
There isn't an idiom that means riding a lamb - people make idioms for things that are commonly seen or done, and people don't really ride lambs much.
This is a Southern US saying meaning 'a whole lot of' something.
It's not an idiom. It means exactly what it says: "quick" means fast or rapid, "curse" means speak scathingly or angrily; "your lot" is your fate in life.
It means to talk a lot without saying anything of value.
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.