expression, ichidan verb
sit knee to knee; sit opposite each other; have a candid talk
Literally describes sitting so close that knees touch; idiomatically implies a frank, intimate discussion. Often used for serious or heartfelt conversations.
彼と膝を突き合わせて将来のことを話し合った。
I sat knee to knee with him and talked about our future.
問題を
Let's sit down together and have a candid discussion to solve the problem.