in jeopardy
to be at risk; to be at peril. John puts himself in jeopardy every time he goes skydiving. I was in jeopardy when my car broke down on the deserted road.
○○had a meeting with his clients, but he didn't mentioned ( ) one.
each whoever neither which があったとおもうのですが、どのクライアントとアウトは言わなかったという意味で、whichではないかと思うのですがいかがでしょう?