We've found 3 phrases for boasting (0.131 seconds):

all talk and no action »    Speaking, promising, or boasting much, but doing little

full of it »    Speaking nonsense; lying, exaggerating, or boasting.

it's not the whistle that pulls the train »    Boasting and loud talk should not be mistaken for the work that produces real achievements; bravado is no proof of action.1956, James Reston, "Washington: It's Not the Whistle that Pulls the Train," New York Times, 1 July, p. E8:

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