Meaning: one more thing to ensure something. Origins and uses.
Rewrite 1: another lock on the door
Rewrite 2: one more knot1nb in the noose
Rewrite 3: one more second off the recordn4
Rewrite 4: another quarter in the meter

Comment: Although some would attribute this cliché to ensuring death, it can apply to many more situations. Thus, I’ve tried to broaden the examples.

More reading about clichés
What I found when I googled “clichés”:
• Cliché Challenge: “How various clichés of our times are faring based on the number of references on Google.”