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to show that something is true or real through one's actions
She showed that she was ready to walk the walk by doing archaeology every week.
To be destroyed or sacrificed; be fired: Rostow's Deputy Walks the Plank; Rostow Hangs In/ If you don't have the votes, you don't make your friends walk the plank
[1835+; fr the pirate practice of forcing unwanted persons to walk out on a plank and plunge into the sea]