When Ziz[1] meets Ziz[1],that is, Δ meets Δ

When Ziz[1] meets Ziz[1],that is, Δ meets Δ, it usually means three things:
Δ Ziz Vivorin harmonize Δ Ziz Vivorin, abbreviation is Δ HMY Δ
Δ Ziz Vivorin overwhelm Δ Ziz Vivorin, abbreviation is Δ OVL Δ
Δ Ziz Vivorin undermine Δ Ziz Vivorin, abbreviation is Δ UDM Δ