1)at a loss
Meaning:filled with bewilderment
EX:At a Loss
What To Expect When You're No Longer Expecting
From:http://abcnews.go.com/Health/Depression/story?id=4665859

2)bigwig
Meaning: the most important person in a group or undertaking
EX:'POP' TART SCAMS BIGWIG
From:http://www.nypost.com/seven/11282006/news/nationalnews/
pop_tart_scams_bigwig_nationalnews_dan_mangan.htm

3)break even
Meaning:make neither profit nor loss
EX:How to Do a Break even Analysis?
From:http://entrepreneurs.about.com/od/businessplan/a/breakeven.htm