go back on (one's) pledge

go back on (one's) pledge

To not do something one said one would do; to renege on something. People are beginning to worry that the governor is going to go back on his pledge and not lower taxes for lower-income families after all. You made a commitment to support our project, and now you've gone back on your pledge! If the board goes back on their pledge to fund our research, we can't possibly continue.

See also: back, go, on, pledge

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