The phrase "passed out" is often used to describe someone losing consciousness due to an external factor, such as alcohol or heat stroke. There are many different synonyms for this phrase that are commonly used in English. Some of the most popular options include "fainted," "collapsed," "blacked out," "lost consciousness," and "went out." These different synonyms can be used in different situations to convey different nuances of meaning. For example, "faint" may imply a more sudden loss of consciousness, while "black out" may suggest a longer period of unconsciousness. Whatever phrase is used, it's important to remember that passing out can be a dangerous medical condition and should always be taken seriously.