Using only a sequence of transpositions, see if you can take this:
while maintaining English words on each of the three horizontals.
At each step, you may transpose any two neighboring letters, either up-down or left-right.
At each step, you must have three horizontal English words.
All the words along the way should be common and familiar (certainly no less familiar than LUSHER). No need to reach for the dictionary.
If you want a similar puzzle but with more horizontal action, please see the exciting sequel here.