knock something together

Từ điển Oxford Advanced Learner 8th

ˌknock sthtoˈgether derived
1. (informal)to make or complete sth quickly and often not very well
•I knocked some bookshelves together from old planks.
2. (BrE)to make two rooms or buildings into one by removing the wall between them
•The house consists of two cottages knocked together.
Main entry: ↑knock_derived