Yokozuna
Sumo Grand Champion
noun
The "side rope." This doesn't make much sense. What this is, though (you'll want to look at the reading), is the Yokozuna. This is the Sumo Grand Champion.
The readings are the ones you learned with the kanji.
今は単なる凡人のように見えるかもしれないけど、こう見えてもかつては横綱だったんだよ。
I may look like just an ordinary man now, but I used to be a Sumo grand champion.