in a flash
in the blink of an eye
in a wink
'I know you understand,' he said and gave a conspiratorial wink.
Instead, you can close one of your eyes and give them a wink (眨眼).

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Open the tool →一眨眼 (yì zhá yǎn) means “in a flash, in the blink of an eye, in a wink”.
一眨眼 is pronounced yì zhá yǎn in Mandarin Chinese.
“in a flash” is 一眨眼 (yì zhá yǎn) in Chinese.
This page has 2 example sentences using 一眨眼, each with pinyin and an English translation.