There are many different synonyms for the phrase "lose consciousness of." Some of these include "fall out," "pass out," "black out," "faint," "collapse," and "swoon." All of these terms refer to the act of losing awareness or consciousness, either temporarily or permanently. While some of these words may be used interchangeably, each carries with it a slightly different connotation or meaning. For example, "black out" suggests a sudden and complete loss of consciousness, while "faint" implies a gradual fading or dimming of awareness. Choosing the right synonym can help you communicate your meaning more precisely and effectively.