double-cross

To promise one thing and deliver another; to deceive.

The lawyer double-crossed the inventor by manufacturing the gadget instead of fulfilling his promise to arrange a patent for his client.

Compare: SELL DOWN THE RIVER, TWO-TIME.

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Source: A Dictionary of American Idioms

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cross

[cross] See: [AT CROSS PURPOSES], [CARRY ONE'S CROSS], [DOUBLE CROSS], [KEEP ONE'S FINGERS CROSSED] at [CROSS ONE'S FINGERS] (1b). A Dictionary of American Idioms

do a double take

[do a double take] {v. phr.}, {informal} To look again in surprise; suddenly understand what is seen or said. * /John did a double take when he saw Bill in […] A Dictionary of American Idioms

double-check

[double-check] {v.} 1. To do a double check on; look at again very carefully. * /When the last typing of his book was finished, the author double-checked it./ 2. To […] A Dictionary of American Idioms

cross up

[cross up] {v.}, {informal} 1. To block or upset; throw into confusion or disorder. * /We were going to catch him at the gate, but he crossed us up by […] A Dictionary of American Idioms

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