Anti-Dive Comp
A composition built around peel — Brig, Lucio, etc. — that turns the enemy's dive into a one-way trip.
A comp that denies the dive cycle — commit, isolate the target, exit — from ever completing, using CC, knockback, and instant healing. Brig's Shield Bash + Rally, Lucio's speed + Soundwave (boop), Kiriko's Swift Step and the like carry the peel. It is usually built as a reactive swap, and the essence is making the diving side read "if we go in, we get turned around" so their engages shrink. The moment it is on the board, the dive side is forced to decide whether to switch its style to Poke or Brawl. The ideal shape is that simply having anti-dive up makes the dives disappear — its value is highest when no fight actually happens.
Swapping into it once a dive lineup — Genji/Tracer/Winston etc. — shows up on the enemy side. As the answer when your backline keeps getting dropped by repeated dives.
You build anti-dive but Brig/Lucio positioning is bad, so the divers that commit never get punished. Or the anti-dive costs you frontline damage and you get ground down by poke instead of dive and lose.
Peel
Switching mid-fight focus to protect a backline ally from a diving threat.
Dive
High-mobility composition that bursts down enemy supports and disengages immediately.
Stagger
Delaying an enemy kill so they respawn out of sync with their team for the next fight.
Main Support
A support role — Lúcio, Mercy, Brig — focused on area healing, mobility boosts, and formation tempo rather than damage output.