Lost in thought: This implies someone is deeply absorbed in their own mind, not paying attention to their surroundings.
Lost in translation: This refers to a situation where something is miscommunicated, often due to cultural or linguistic differences.
Lost cause: This describes a person or situation that is considered hopeless or beyond help.
Lost soul: This signifies someone who is lonely, troubled, or directionless in life.
Lost love: This refers to a romantic relationship that has ended, leaving one or both parties feeling sad and heartbroken.
Lost track of time: This means someone has become so engrossed in an activity that they didn't notice how much time has passed.
Lost in the shuffle: This describes something that is overlooked or forgotten in a busy or crowded situation.
Lost your way: This suggests someone is confused or uncertain about their direction in life, physically or metaphorically.
Lost your touch: This implies someone has lost their skill or ability in a particular area.
Lost your marbles: This is a humorous way to say someone is acting confused or senile.
Lost in the sauce: This is a slang term for someone who is enjoying themselves and acting impulsively, often due to the influence of alcohol or drugs.
These are just a few examples, and the figurative meaning of "lost" can be further nuanced depending on the context.