ひっくりhikkuriかえ返kaeるru
1.
To experience a significant change that disrupts the previous state of affairs, often resulting in a complete reversal of circumstances.
2.
To lose balance or stability, leading to an unexpected or uncontrolled descent or collapse.
3.
To turn over or rotate completely, causing something to end up in an opposite position or orientation.
Example:
彼は体の平衡を失って、ひっくり返った。