Dutch courage
US /ˌdʌtʃ ˈkɝː.ɪdʒ/
UK /ˌdʌtʃ ˈkɝː.ɪdʒ/

1.
courage inspired by drinking alcoholic liquor
:
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He finally asked her out after a few drinks, fueled by a bit of Dutch courage.
•
His bravado was nothing more than Dutch courage.
courage inspired by drinking alcoholic liquor