false alarm noun [ C ]假警报；虚惊。
= an occasion when people wrongly believe that something dangerous or unpleasant is happening or will happen
扩展false friend noun [ C ]（另一语言中的某个词的）形近异义词，同形异义词，同音异义字。
= a word that is often confused with a word in another language with a different meaning because the two words look or sound similar

【例句】
She thought she was pregnant, but it turned out to be a false alarm (= she was not).
她以为自己怀孕了，但后来发现是一场虚惊。

The French word "actuellement" and the English word "actually" are false friends.
法语单词 actuellement 和英语单词 actually 是一对形近异义词。