warn someone about the danger

Meaning

This expression means to alert or inform a person about a potential risk, hazard, or safety issue so they can avoid it. It is used in both everyday situations and formal safety contexts.

Examples

• The lifeguard ran to warn the swimmers about the danger.

  The lifeguard ran to warn the swimmers about the danger.

• I tried to warn him about the danger, but he wouldn't listen.

  I tried to warn him about the danger, but he wouldn't listen.

• Signs are posted along the cliff to warn people about the danger.

  Signs are posted along the cliff to warn people about the danger.

• We need to warn everyone about the danger of walking on thin ice.

  We need to warn everyone about the danger of walking on thin ice.

• She called her neighbors to warn them about the danger of the approaching storm.

  She called her neighbors to warn them about the danger of the approaching storm.

Common Mistakes

• ✗ I warned him for the danger.

  ✓ I warned him about the danger.

  Use the preposition 'about' (or sometimes 'of') after the verb 'warn' when introducing the hazard, not 'for'.

• ✗ She warned about the danger to me.

  ✓ She warned me about the danger.

  The person being warned should directly follow the verb 'warn' as a direct object, without using the preposition 'to'.

Related Expressions

Practice

• The safety signs are designed to ___.

  💡 Alert others to potential risks.

  Show answer

  warn people about the danger

• Why didn't you ___ before I went inside?

  💡 Tell me about the risk.

  Show answer

  warn me about the danger