迷惑means trouble, annoyance, or nuisance. It is a key concept in Japanese social etiquette, referring to the discomfort or inconvenience caused to others. It originally meant to be lost or deluded in Buddhist terms.
That is how Fuguro works. It brings 迷惑 back for review right before you forget it, each time a little later, until it sticks for good. You hear it spoken aloud, and you meet it again in stories you can already read. The first five levels are free.