Fail-safe and Off the hook

Fail-safe adjective - Not likely to fail.

Off the hook and fail-safe are semantically related. In some cases you can use "Off the hook" instead an adjective phrase "Fail-safe".

Off the hook adjective - Freed from danger or blame or obligation.

Fail-safe and off the hook are semantically related. Sometimes you can use "Fail-safe" instead an adjective phrase "Off the hook".