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To boast.
"boasting" is conjugation of the verb - "Stop boasting, it does you no favour".
Yes, boasting has an a in it, no matter who is doing the boasting about whom.
The ball sport where boasting is the part of the game is in squash. Boasting can refer to an offensive or defensive move in the sport.
a person who is always boasting is called a braggart.
No