janli -jal- gismu

x₁ collides with/crashes/bumps/runs into x₂.

(also collide = simjanli for a collision between two moving objects); See also darxi.

jbovlaste

In notes:

darxi: x₁ hits/strikes/[beats] x₂ with instrument [or body-part] x₃ at locus x₄.
jalsimgau: g₁ [agent/person] claps together/causes to collide/strikes together s₁
jalsi'u: s₁ (set) collide with each other.
mirjanli: j₁=m₂=m₄ bounces off j₂=m₁ to point m₃.
xanjalgau: g₁=x₂ claps hands j₁=j₂=x₁.