nail one's colours to the mast
/N EY1 L W AH0 N EH0 S K AH0 L ER0 Z T UW0 DH AH0 M AE0 S T/verb
- 1
To clearly show one's support for a side or opinion in a dispute, often indicating an intention to defend that side to the end.
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Source: https://en.wiktionary.org/wiki/nail%20one's%20colours%20to%20the%20mast