stepladder; steps
A portable, self-supporting ladder with flat steps, commonly used for household tasks like changing light bulbs or reaching high shelves.
電球を交換するために脚立を使った。
I used a stepladder to change the light bulb.
脚立を広げて、棚の上の荷物を取った。
I opened the stepladder and took down the items from the top shelf.