Meaning
A formal proposal to merge code changes into a main software repository.
Three examples from work
Code review
DeveloperCould you review my pull request for the auth module?
Senior EngineerSure, I'll take a look before the stand-up.
Stand-up update
EngineerMy pull request has been approved and is ready to merge.
Tech LeadGreat, deploy to staging when CI finishes.
Conflict resolution
DeveloperI resolved the merge conflicts in that pull request.
ReviewerThanks, re-running the test suite now.