let's know

phrase2

1. •
   let's learn, find out, or see

   • 2008, Amar Tyagi, Let's Know Handicrafts of India (Star Publications) →ISBN — 2008
2. •
   (informal, rare) let us know, get back to us, keep us posted (often us in sense me)

   • Let's know when Eckleton's playing Haileybury, and I'll come and look you up. I want to see that match. — 1908