Used to show that the thing just referred to is not ideal or does not support the argument, but that the situation cannot be improved upon, or the speaker is unwilling to try.

An aquatic bird of the family Anatidae, having a flat bill and webbed feet. / Specifically, an adult female duck; contrasted with drake and with duckling.

Of or relating to Francis Herbert Bradley (1846–1924), British idealist philosopher.

(video games) Initialism of massively multiplayer online game. / (aviation) Maximum operating Mach number; the Mach number which an aircraft should not exceed in the course of routine operation.