IPA: /ˌoʊ.vərˈtɔɪl/
KK: /oʊvərˈtɔɪl/
To work too hard or too much, leading to exhaustion or fatigue.
He tends to overtoil himself by taking on too many projects at once.
Past: overtolled
Past Participle: overtolled
Overtoil → It is formed from "over-" (meaning excessively) and "toil" (from Old French *toiler*, meaning to labor or work hard). The word "overtoil" means to labor excessively or to work too hard.
Think of working 'excessively' ('over-') and 'laboring hard' ('toil') — that's why overtoil means to work too hard.
No commonly confused words.