toto cœlo (L.), by the whole heavens: diametrically opposite.
totus, teres, atque rotundus (L.), complete, smooth, and round.
toujours perdrix (Fr.), partridge every day—there may be too much even of a good thing.
tour de force (Fr.), a feat of strength or skill.
tout au contraire (Fr.), quite the contrary.
tout à fait (Fr.), entirely.
tout à vous (Fr.), wholly yours.
tout ensemble (Fr.), the whole taken together: the broad or general effect.
tout est perdu hors l'honneur (Fr.), all is lost but honour [said by Francis I. at Pavia].
tout le monde (Fr.), all the world, everybody.