Sit tight. I'll be right back.

别慌张，我马上回来。

Shareholders are being advised to sit tight until the crisis passes.

股东们得到的忠告是，静待危机过去。

Sit tight. I'll be ready soon.

坐这儿别动，我一会儿就准备好。

Sit tight and don't move that leg.

你安静地坐好，不要老动那条腿。

Sit tight at the edge of the sledge.

牢牢坐在雪橇边。