to be kidding
be
kɪdɪng
kiding
<abbr style="text-decoration: underline;" title="kidding / joking" >kidding</abbr>

英語での「be kidding」の定義と意味

to be kidding
01

to show surprise or disbelief about something someone has said, often because it seems unlikely or too unbelievable 

コロケーション
例
You won the lottery? You're kidding! 
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