IPA: /ˌriːˈɪn.dʒər.i/
KK: /riˈɪndʒəri/
An injury that happens again after a previous one has healed.
After recovering from his ankle sprain, he was careful to avoid a reinjury during practice.
Reinjury → It is formed from "re-" (meaning again) and "injury" (from Latin "injuria", meaning harm or wrong). The word "reinjury" means to cause harm or injury again.
Think of 'again' ('re-') causing 'harm' ('injuria') — that's why reinjury means to injure again.