Dutch courage

US /ˌdʌtʃ ˈkɝː.ɪdʒ/
UK /ˌdʌtʃ ˈkɝː.ɪdʒ/
"Dutch courage" picture
1.

courage inspired by drinking alcoholic liquor

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