jones girls are known for one tracking. i think we come by it honestly, seeing as how both of my parents do it. oh come on, dad - you know you do, too. so imagine my amusement this morning when i saw that the word of the day is the proper term for one tracking.
idée fixe \ee-day-FEEKS\ noun
: an idea that dominates one's mind especially for a prolonged period : obsession
The fear that he was going to be fired became such an idee fixe for Toby that he could think of nothing else.