at the first sign of trouble
Pronunciation
/æt ðə fˈɜːst sˈaɪn ʌv tɹˈʌbəl/

英語での「at the first sign of trouble」の定義と意味

at the first sign of trouble
01

as soon as the earliest warning or indication of a problem appears 

At the first sign of trouble, the team stopped the experiment. 
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