Aim for a straight up and down, firm handshake.

你的目标是竖直方向上下的坚定的握手。

youdao

I ran straight up to Columbia County, then turned East, came down the Harlem Valley and thence home.

我一直跑到哥伦比亚县，然后向东转，沿着哈勒姆山谷，从那里跑回家。

《柯林斯英汉双解大词典》

Lie down and look straight up through the branches; climb a tree to look down the path.

躺下，透过树枝向上直视；爬上一棵树向下看。

youdao

In case you failed punk rock 101, pogoing is a dance where you jump straight up and down.

NPR: Finding 'Employment' With the Kaiser Chiefs

And as the debate continues, with no partisan games and straight up-and-down votes on a range of incremental amendments, Democrats will build even more political momentum and public confidence.

FORBES

Indeed, calm finally descended on the schizophrenic stock market on Friday (Aug. 12, 2011), when the market averages closed the week on an up note after four straight days of violent up-and-down swings of some 4%.

FORBES: Some Seasoned Pros See The Calm After The Market's Schizophrenic Swings as Presaging Upbeat Days Ahead Through Yearend