Bluff (one's) way through (something) phrasal verb
The preposition "through" in the phrase "bluff (one's) way through (something)" can be flexibly replaced by other prepositions such as "in", "into", or "out of" depend on the involving circumstances.
To cope with a difficult situation successfully by making other people believe something which is not true
These students managed to bluff their way through the test.
They are trying to bluff its way through the budget process.
White lie
Used to imply that someone is acting as if he or she is demure, innocent, sincere or reserved but they may be not
To maintain someone's attention or to keep them waiting in a state of uncertainty.
To be dishonest or deceptive and no one can believe
The verb "bluff" should be conjugated according to its tense.
The word "bluff" comes from either the Dutch word bluffen, which means brag, or verbluffen, which means to baffle, mislead. To bluff your way out of something means to mislead in a way that makes you look better, which is a perfect combination of both those meanings. In the late 17th century, "bluff" took on the meaning blindfold, or hoodwink, which also both carry the connotation of deception. By 1864, bluff became the term for lying in the game of poker. Originally, the phrase was an act of bluffing. From there, the phrase "bluff your way out" developed, as players would "bluff their way through" the round when they didn’t have the best cards.
Used to allude that the last force, problem or burden which is seemingly minor and small causes a person, system or organisation to collapse or fail
Her husband's violent act last night was the straw that broke the donkey's back and she left him