a. Go back to square one = return to the starting point
b. A ballpark number = roughly accurate number
c. Big picture = a complete view
d. Change of pace = bring some variety in life
e. Get down to business = to get serious
f. Ground-breaking = innovative
g. In a nutshell = In short
h. Under the table = secretly (paying bribes)
i. Thinking out of the box = thinking freely
j. Stay on your toes = Stay alert