thing or two
Quite a lot, as in You can count on Bob to tell you a thing or two about Iran. This term is nearly always an understatement. [Mid-1800s] Also see under know all the answers.
Does “Bimonthly” Mean Twice A Month Or Every Two Months?Both! Bimonthly can refer to something happening "every two months" or "twice a month." Yep, bimonthly has, fittingly enough, two meanings.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.