Emily Dickinson Lexicon

BOAST, v.i. [W. bostiaw, to boast, to toss or throw; G. pausten, to blow, swell, bounce; Sw. pösa, Dan. puster, id. Qu. Gr. φυσαω, to inflate; Russ. chvastayu, to boast; L. fastus.]

1. To brag, or vaunt one's self; to make an ostentatious display, in speech, of one's own worth, property, or actions. Not of works, lest any man should boast. – Eph. ii. 9.
2. To glory; to speak with laudable pride and ostentation of meritorious persons or things. I boast of you to them of Macedonia. – St. Paul. 2 Cor. ix. Usually, it is followed by of; sometimes by in.
3. To exalt one's self. With your mouth you have boasted against me. – Ezek. xxxv.