Adverb

drum

Translation

therefore, that's why, for that reason

Er war krank, drum blieb er zu Hause.

He was ill, that's why he stayed at home.

Drum prüfe, wer sich ewig bindet.

Therefore, examine well whoever commits eternally.

Drum + V + S ... (at the start of a clause, verb in 2nd position) therefore... Drum ging er nach Hause.

deshalb (therefore), deswegen (that's why), daher (hence)

A shortened, more poetic or colloquial form of 'darum' (therefore).

Think of it as a punchy way to say 'therefore', like a drum beat announcing a conclusion.