From Longman Dictionary of Contemporary Englishthis is itthis is itspokenNOW used to say that something you expected to happen is actually going to happen This is it, boys – the moment we’ve been waiting for. → it
Examples from the Corpus
this is it• But I have to tell you, this is it.• But if you want state-of-the art, this is it.• If ever more evidence were needed to confirm that Michael Jackson is truly washed up, this is it.• If rugby ever had an own-goal masquerading as a laudable aim this is it.• Okay, so this is it.• Yet if ever there was a time to put the record straight, this is it.• Cancer has taught me that life isn't a dress rehearsal, this is it and you only get the one chance.• I think this is it for him.this is itthis is itused to say that something you expected to happen is actually going to happen This is it, boys, the moment we’ve been waiting for. → thisExamples from the Corpus
this is it• But I have to tell you, this is it.• But if you want state-of-the art, this is it.• If ever more evidence were needed to confirm that Michael Jackson is truly washed up, this is it.• If rugby ever had an own-goal masquerading as a laudable aim this is it.• Okay, so this is it.• Yet if ever there was a time to put the record straight, this is it.• Cancer has taught me that life isn't a dress rehearsal, this is it and you only get the one chance.• I think this is it for him. 