expression, i-adjective
extremely robust; strong enough for an elephant to step on
Idiomatic expression used to describe something extremely sturdy or durable, often in a hyperbolic or humorous way. The literal meaning is 'won't break even if an elephant steps on it'.
このスマホケースは象が踏んでも壊れないって宣伝してるよ。
They advertise this phone case as being so tough that even an elephant stepping on it wouldn't break it.
あのテントは象が踏んでも壊れないくらい頑丈らしい。
That tent is said to be so sturdy that it wouldn't break even if an elephant stepped on it.