Verb
top oneself (third-person singular simple present tops oneself, present participle topping oneself, simple past and past participle topped oneself)
(US, idiomatic) To outdo oneself or do more than one's previous best.
top oneself (third-person singular simple present tops oneself, present participle topping oneself, simple past and past participle topped oneself)
(Britain, slang) To commit suicide.
Synonyms: suicide, take one's own life