今度新規ビジネスを始めるんだ。それで物は相談なんだけど、君、一枚噛んでくれないか。

tbd

We've got some new business coming in and I want to discuss it with you. Do you mind getting involved?

どうも彼はその件に一枚かんでいるようだ。

tbd

It sounds to me as if he has something to do with the matter.