What is "to declare one's self"

Declare \De*clare"\ (d[-e]*kl[^a]r"), v. t. [imp. & p. p. Declared (d[-e]*kl[^a]rd"); p. pr. & vb. n. Declaring.] [F. d['e]clarer, from L. declarare; de + clarare to make clear, clarus, clear, bright. See Clear.]

1. To make clear; to free from obscurity. [Obs.] ``To declare this a little.''
   --Boyle.

2. To make known by language; to communicate or manifest explicitly and plainly in any way; to exhibit; to publish; to proclaim; to announce.

   This day I have begot whom I declare My only Son.
   --Milton.

   The heavens declare the glory of God.
   --Ps. xix. 1.

3. To make declaration of; to assert; to affirm; to set forth; to avow; as, he declares the story to be false.

   I the Lord . . . declare things that are right.
   --Isa. xlv. 19.

4. (Com.) To make full statement of, as goods, etc., for the purpose of paying taxes, duties, etc.

   To declare off, to recede from an agreement, undertaking, contract, etc.; to renounce.

   To declare one's self, to avow one's opinion; to show openly what one thinks, or which side he espouses.