Close to Melee is a trait in Destiny 2 that can appear on 18 weapons. There is also an enhanced version with a stronger effect.
What Close to Melee does
Glaive projectile final blows improve Glaive melee damage. Glaive projectile or melee damage extends the duration.
Enhanced version
Glaive projectile final blows improve Glaive melee damage for an improved duration. Glaive projectile or melee damage extends the duration.