A fear of losing used to describe a person who is overly competitive.(noun)
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Use "kiasu" in a sentence
"The huge jump in prices did not surprise me, because Singaporeans are basically very "kiasu" at heart, causing prices to escalate at the prospect of the supply of COEs falling."
"Called KiasuParents. com -- the word "kiasu" means overly competitive -- it allows parents to compare notes on private learning centres, with 21,000 members registered since September"
"For the benefit of Singaporeans, it is much better for them to be less 'kiasu' and adopt a more accommodative attitude, especially with neighbours like Malaysia."