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Idiom

throw a spanner in the works

idiom (verb phrase) B2
/θroʊ ə ˈspænɚ ɪn ðə wɝks/

Meanings

idiom (verb phrase)

To cause a sudden problem that disrupts progress or prevents something from working as planned.

Visual cue for throw a spanner in the works — meaning 1

Definition

To throw a spanner in the works means to cause an unexpected problem that stops or delays a plan or process.

To throw a spanner in the works means to disrupt something that was working smoothly. It refers to an unexpected problem or action that creates delays, confusion, or failure. People often use it when a plan is going well but something suddenly interferes.

Examples

  • The supplier delay threw a spanner in the works and pushed our launch back a week.
  • I was ready to sign the contract, but the new rule threw a spanner in the works.
  • His last-minute injury threw a spanner in the works for the team’s training plan.
  • We had everything organized until the storm threw a spanner in the works.
  • A missing document threw a spanner in the works during the application process.