"Tuckered out" is an expression used to describe someone who is exhausted or extremely tired. While there are numerous words that can be used to convey a similar meaning, some of the common synonyms for the term include "worn out", "exhausted", "lethargic", "spent", "fatigued", "drained", "whacked", "knackered", and "dead beat". All of these words carry a similar connotation and can be used interchangeably to suggest that someone is physically or mentally drained. Whether it's after a long day at work or a strenuous exercise routine, being tuckered out is a relatable experience that can be described in a variety of ways.