IPA: /rɪˈstʌdi/
KK: /rɛˈstʌdi/
To study something again in order to understand it better or to prepare for an exam.
I need to restudy the material before the test next week.
Past: restudied
Past Participle: restudied
Restudy → It is formed from "re-" (meaning again) and "study" (from Latin "studium", meaning zeal or application). The word "restudy" means to study again or revisit the material with renewed effort.
Think of 'studying again' — 're-' means again, and 'study' refers to the act of learning.