put the tin hat on (something)

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put the tin hat on (something)

To finalize, or finish off, or mark the end something, especially in a forceful, decisive, or dramatic way. Primarily heard in UK. What put the tin hat on it for me was his insistence that we maintain the same direction for the next financial year. I put in my resignation the very next day. The downgrading of the company's credit rating puts the tin hat on a disastrous year for their financial situation.
See also: hat, on, put, tin
References in periodicals archive ?
The knowledge that while engaged in the not inconsiderable task of bringing peace to the Middle East as the "Peace Envoy" he was haggling with Tesco over an alleged pounds 1million-a-year role helping them open stores in the, er, Middle East puts the tin hat on his collapsing reputation, surely.