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at the drop of a hat▼(instantly, without hesitation)preposition[UK: ət ðə drɒp əv ə hæt] [US: ət ðə ˈdrɑːp əv ə ˈhæt]
in the blink of an eye▼(immediately, instantaneously)preposition
blink [blinks]▼(a quick view)noun[UK: blɪŋk] [US: ˈblɪŋk]
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