safety

• Duck and cover

  To quickly crouch down and shield one's head and body, typically as a defensive measure during an immediate and sudden threat like an explosion or earthquake.

• Given the all-clear

  To be given permission to proceed or confirmation that a dangerous or restrictive situation has ended.

• An accident waiting to happen

  This phrase describes a situation, person, or object that is so inherently flawed or risky that a negative event or disaster is highly likely to occur.

• Build a fence at the top of the cliff, not an ambulance at the bottom.

  It is wiser and more effective to prevent a problem from occurring than to deal with its consequences after it has happened.

• Precious cargo

  The phrase refers to someone or something considered extremely valuable, important, or vulnerable, thus requiring special care and protection.

• Warning sign

  An indication or signal that something negative, dangerous, or undesirable is likely to occur.