at its (或 someone's) worst

in the most unpleasant, unimpressive, or unattractive state of which someone or something is capable

在最壞的情況下（在某人最糟的時候）

nothing's working at the moment, so I suppose you've seen us at our worst.

那時一切都不在運轉，因此我覺得你看到的是我們最糟的時候。

at worst (或 the worst)

in the most serious case

在最嚴重的情況下，在最壞的情況下

at worst the injury could mean months in hospital.

在最壞的情況下，傷員得在醫院躺上幾個月。

be one's own worst enemy

at worst the injury could mean months in hospital.

在最壞的情況下，傷員得在醫院躺上幾個月。

do one's worst

do as much damage as one can (often used to express defiance in the face of threats)

［挑戰用語］有什么手段盡管使出來

let them do their worst—he would never surrender.

讓他們有什么手段盡管使出來吧——他永不投降。

get (或 have) the worst of it

be in the least advantageous or successful position; suffer the most

遭到失敗；處于最不利的境地；大吃苦頭

if the worst comes to the worst

if the most serious or difficult circumstances arise

如果事情壞到無可再壞，如果最壞的事發生；到一籌莫展的時候

at (the) worst

Under the most negative circumstances, estimation, or interpretation

在最壞的形式下：在最惡劣的環境，在最保守的估計下，在最不利的解釋下

At worst, the storm will make us postpone the trip.

最壞的估計是暴風雨會使我們推遲行程

get the worst of it 或 have the worst of it

To suffer a defeat or disadvantage.

遭受失敗或損失

if (the) worst comes to (the) worst

If the very worst thing happens.

如果最壞的事發生

in the worst way【非正式用語】

Very much; a great deal

非常地；十分地

wanted to be elected in the worst way.

極想當選