IPA: /ˌoʊvərɪkˈzɜrʃən/
KK: /oʊvərɪkˈzɜrʃən/
Doing too much physical or mental work, which can lead to pain or injury.
After the marathon, she felt tired due to overexertion during the race.
Overexertion → It is formed from "over-" (meaning excessively) and "exertion" (from Latin "exertio", meaning to put forth or exert). The word describes the act of putting forth effort excessively or beyond normal limits.
Think of 'over' meaning excessively and 'exertion' meaning effort — this helps you remember that overexertion means putting in too much effort.