The story
From roll up + on; semantically and morphologically parallel with roll up + to.
Etymology from Wiktionary, CC BY-SA 4.0.
roll up on
Today it means: To sneak up to (someone or something) with the intention of causing harm. Full definition →
Today it means: To sneak up to (someone or something) with the intention of causing harm. Full definition →
From roll up + on; semantically and morphologically parallel with roll up + to.
Etymology from Wiktionary, CC BY-SA 4.0.