
Nail your colours to the mast
Metaphoric Origin
Originally, 'nailing your colours to the mast' referred to ships' flags, symbolizing a refusal to surrender.

Even when the outlook was bleak, the CEO nailed his colours to the mast, keeping faith in his company's mission.
Bravery Implied
Using this phrase often implies bravery or commitment since it suggests taking a risk for one's beliefs.

She nailed her colours to the mast by defending her project in front of the skeptical investors.
Irreversibility
The phrase can imply a point of no return, indicating a definitive public commitment.

After he nailed his colours to the mast on live TV, there was no going back on his statement.
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