knock back:
To knock something back is to turn it down or reject it:
“The management upped the offer to three percent but the union knocked it back”
This rejection can happen to people as well as things:
“Ah said Ah’d gie her a lift hame but she gave us a knock back.”
An instance of either if these is a knockback:
“Ah hear she applied for that job an got a knockback.”
“Cheer up son, never had a knockback aff a lassie before?”
a Brit different 
“Cheer up son, never had a knockback aff a lassie before?” hilarious.
I’m glad you’re back. I’ve certainly missed the word of the week. Your accent is just so delightful to listen to!!
I missed you! We all did. So glad to have you back and to hear your lovely and lilting voice.
So glad you put up my favorite weekly vocab lesson.
Of course you can knock back a pint too. As in “How many have you knocked back?”