Also, at the most or at the outside. At the largest amount, the furthest limit; also, in the most extreme case. For example, She'll be finished in two weeks at the most, or It'll take two weeks at the outside, or At most the chef uses a tiny bit of pepper. The terms with most date from the 1300s; at the outside from the mid-1800s. Also see at best.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.