'To boast one's self' definitions:

Definition of 'To boast one's self'

From: GCIDE

Boast \Boast\, v. t.
1. To display in ostentatious language; to speak of with pride, vanity, or exultation, with a view to self-commendation; to extol. [1913 Webster]
Lest bad men should boast Their specious deeds. --Milton. [1913 Webster]
2. To display vaingloriously. [1913 Webster]
3. To possess or have; as, to boast a name. [1913 Webster]
To boast one's self, to speak with unbecoming confidence in, and approval of, one's self; -- followed by of and the thing to which the boasting relates. [Archaic] [1913 Webster]
Boast not thyself of to-morrow. --Prov. xxvii. 1 [1913 Webster]