"word of mouth" = telling one person to another by speaking
"Many stores sell most of their products by word of mouth."

"pull out all the stops" = do everything possible to make something succeed
"The company pulled out of the stops to improve business, including cutting prices up to 50%."

"keep an eye on" = watch carefully
"Be sure to keep an eye on the kids so they don't get to close to river."

"homesick" = sad at being away from home or things that are familiar
"My roommate is really homesick and can't think about anything else but his mom's cooking."

"get under someone's skin" = annoy or bother someone
"My brother gets under my skin when he enters my room without knocking."

"stay-at-home mom" = a mother who doesn't have a job outside the home
"My sister finds satisfaction in being a stay-at-home mom."

"hit it off" = get along well
"My daughter and her boyfriend hit it off well from the first date."

"call it quits" = end a relationship
"Hey. I'm your father, and I don't like that boy. You need to call it quits, or else!"

"turn over a new leaf" = change personal habits
"I've decided to turn over a new leaf; I'm going to exercise three times a week and not play so many video games."

"ring in the new year" = celebrate the new year
"We're going to ring in the new year at my sister's house next week."