“落選”的英文翻譯可以是：

**1. fail to be elected** (最常用，特指選舉中落選)
- 例句：He failed to be elected as the committee chair.
(他落選了委員會主席的職位。)

**2. lose an election** (強調在競爭中失敗)
- 例句：The incumbent lost the election by a narrow margin.
(現任者以微弱差距落選。)

**3. be defeated** (通用表達，適用于競賽或選舉)
- 例句：She was defeated in the final round of the competition.
(她在比賽的最后一輪落選。)

**4. not be selected** (泛指未被選中，如職位或獎項)
- 例句：His proposal was not selected for the final review.
(他的提案未入選最終評審。)

**5. fall through** (口語化表達，指計劃或機會未實現)
- 例句：Her plans to study abroad fell through.
(她留學的計劃落空了。)

根據具體語境選擇合適的翻譯即可。