An instance of selling or guaranteeing more seats than are available.(noun)
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Use "overbooking" in a sentence
"The passengers of spaceship Earth are sick and tired of the bloodshed in the Middle East, caused by what is basically an "overbooking" of Palestine by a coterie of politicians influenced by inane religious (e.g. fundamentally anti-semitic Christian) worldviews, who also regarded as an irrelevant and negligible quantity the Arab population that had already been living in Palestine for centuries."
"#2 is correct, "overbooking" has been going on for many years."
""overbooking", where they essentially sell more tickets than there are seats on a plane."