to cause someone to worry or feel anxiety because of being thought about too often: His experiences in Vietnam still haunt him.

to visit habitually or appear to frequently as a spirit or ghost: to haunt a house; to haunt a person.

haunt somebody if something unpleasant haunts you, it keeps coming to your mind so that you cannot forget it The memory of that day still haunts me. For years she was haunted by guilt. haunt somebody to continue to cause problems for someone for a long time That decision came back to haunt him. She has been haunted by her past during her career.