to leave (someone or something) alone: not to disturb, to stay away from (also: to let alone) Examples of TO LEAVE ALONE Leave the baby alone for a while and she may go to sleep. After the cat had scratched Peter twice, he let it alone.

all of a sudden: suddenly, without warning (also: all at once) Examples of ALL OF A SUDDEN It seems like, all of a sudden, you’re mad at me, and I can never figure out why. All of a sudden, the storm subsided and the rain stopped.  

to sell out: to sell all items; to arrange for the sale of a company or business Examples of TO SELL OUT – That store is closing its doors for good and is selling out everything this weekend.– If my new business enterprise is successful, I’ll sell it out for a few million dollars.

to live it up: to spend money freely, to live luxuriously Examples of TO LIVE IT UP Jackson and Aiden saved up money for two years so that they could travel to Europe and live it up. After receiving a large inheritance from a rich aunt, I was able to live it up for years.

all in all: considering everything Examples of ALL IN ALL All in all, this was the best marathon I’ve ever run. All in all, I can’t wait to go back to Mackinac Island next year!

back and forth: in a backward and forward motion Examples of BACK AND FORTH She and I went back and forth, continually trading ideas, but we never reached an agreement. My job has me going back and forth between Atlanta and New York right now.