From Longman Dictionary of Contemporary Englishit’s one thing to ..., (it’s) another thing to ..., (it’s) another thing to ..., it’s one thing to ...it’s one thing to ..., (it’s) another thing to ..., DIFFERENTused to say that doing one thing is very different from doing another thing, especially where the second thing is more difficult, important, or serious It’s one thing being able to run fast, but quite another to win a marathon. → thing
