expression
if you value your life
A fixed conditional phrase used as a threat or warning, often followed by an imperative or a statement of what one must do to stay safe.
命が惜しければ、今すぐここを立ち去れ。
If you value your life, leave this place right now.
命が惜しければ、余計なことは言わないことだ。
If you value your life, you'd better not say anything unnecessary.