Origin: 1250–1300; ME
bost (n.),
bosten (v.), of uncert. orig.

Related forms: boast⋅ing⋅ly, adverb
boastless, adjective
Synonyms:
1, 2. Boast, brag imply vocal self-praise or claims to superiority over others. Boast usually refers to a particular ability, possession, etc., that may be one of such kind as to justify a good deal of pride: He boasts of his ability as a singer. Brag, a more colloquial term, usually suggests a more ostentatious and exaggerated boasting but less well-founded: He brags loudly of his marksmanship.