Definition of nail or pin one's colours to the mast in English:

nail (or pin) one's colours to the mast

Declare one’s beliefs or intentions openly: they nailed their colours to the mast of youth revolt
More example sentences
  • I have the chance, finally, to come off the fence and out of the closet, stretch my philosophical wings, nail my colours to the mast, and proudly declare: I am a relativist; je suis un relativiste; ich bin ein Relativist.
  • I think the price probably is a bit of a gamble, but they must be confident because they have nailed their colours to the mast.
  • It might have been better if we hadn't nailed our colours to the mast without being completely happy with them.
See parent entry: mast

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Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
turned backwards