square knot; reef knot; granny knot
A knot tied by crossing the right end over the left first, then the left over the right. In Japanese culture, this is considered the masculine way of tying, contrasted with 女結び (the feminine way). The English glosses vary because the same tying method can produce a square/reef knot or a granny knot depending on the second crossing direction; context usually clarifies which is meant.
See also: 女結び
男結びは、まず右のひもを左の上に交差させて結びます。
For a 男結び, you first cross the right cord over the left and tie it.
There are two ways to tie an obi: 男結び and 女結び.