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to brag; to make grandiose statements. She talks big but can't produce anything. He has some deep need to talk big, but it's just talk—no action.
Brag, boast, as in I don't believe he's ever shot even a duck, but he sure talks big about hunting. This colloquial idiom was first recorded in 1699.
talk bigtalk confidently or boastfully. informal
talk ˈbig(disapproving) tell people how good you are or promise many things: The President talks big but he doesn’t do anything.
in. to brag; to make grandiose statements. He has some deep need to talk big. He can’t do anything.