fall flat

fail completely to produce the intended or expected effect

完全失敗，完全未達到預期效果

his jokes fell flat.

他的笑話都沒有達到預期效果。

fall flat on one's face

fall over forwards

向前跌倒

(as) flat as a pancake

flat out

as fast or as hard as possible

盡可能快；盡最大努力，竭盡全力

the whole team is working flat out to satisfy demand.

整個團隊正竭盡全力來滿足需求。

[as adj. flat-out]the album lacks the flat-out urgency of its predecessor.

這張專輯不像上一張那樣迫在眉睫。

(informal, chiefly N. Amer.)without hesitation or reservation; unequivocally

(非正式，主北美)毅然地，果斷地；毫無保留地；毫不含糊地

in those early days I'd just flat out vote against foreign aid.

開始的那幾天我只會毫不含糊地投票反對外來援助。

[as adj. flat-out]flat-out perjury.

毋庸置疑的偽證。

lying completely stretched out, especially asleep or exhausted

（尤指熟睡或疲憊時）四肢攤開

she was lying flat out on her pink bath towel.

她舒展全身，躺在粉紅色的浴巾上。

on the flat

on level ground as opposed to uphill

在平地上

the car wouldn't go uphill or overtake on the flat.

這輛車既不會爬坡上坎，也不會平地超車。

that's flat

(informal)used to indicate that one has reached a decision and will not be persuaded to change one's mind

(非正式)就這么簡單（用來表示作了決定而且不會改弦更張）

he won't go into a home and that's flat.

他不愿成家，就這么簡單。

go flatting

(Austral./NZ)leave one's family home to live in a flat

(澳／新西蘭)離家租公寓住

in my third year I left home and went flatting with David.

三年級的時候我離開家，和大衛合租了一套公寓。