knock up (someone)

Translations
забеременеть (кого-то)
He accidentally knocked up his girlfriend.
Он случайно сделал свою девушку беременной.
Definitions
To 'knock up (someone)' is an informal phrase with different meanings depending on the region. In British English, it means to wake someone up by knocking on their door. In American English, it is a slang term meaning to make someone pregnant.