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"boast" is also used as a crossword clue. If that's what you saw, the answer is often brag (4 letters).
Definitions
To speak proudly; also to have something as a feature.
Word origin
From Middle English bosten, from bost (“boast, glory, noise, arrogance, presumption, pride, vanity”), probably of North Germanic origin, ultimately from Proto-Germanic *bausuz (“inflated, swollen, puffed up, proud, arrogant, bad”).
Used in a sentence
“It was his regular boast that he could eat two full English breakfasts in one sitting.”
“On no account will he or any other kind be able to boast that he's escaped the pursuit of those who can follow so detailed and comprehensive a method of enquiry.”
“Lest bad men should boast / Their specious deeds.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Speak with excessive pride”5 letters
02“Brag openly”5 letters
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