is it

Interjection

1. Used other than figuratively or idiomatically: see is, it.
   • - It's ten o'clock already.
     - Is it?
   • It’ impossible, or is it?
2. (Canada, India, Multicultural-London-English, South Africa) really? is that so?
   • - I'm feeling tired.
     - Is it?
   • Thou shalt not express your shock at the fact that Sharon got off with Brad at the club last night by saying "is it?"2007, Dan le Sac vs. Scroobius Pip, "Thou Shalt Always Kill" on Angles

Particle

is it

1. (Malaysia, Singapore, Wales) Final interrogative particle forming a tag question.
   • You forgot, is it?
   • You think you slang-slang a bit I scared, is it? Bloody fool!1994, Michael Chiang, Private Parts & Other Play Things, page 242

   Synonyms:

   or not