pick up an accent

put on an accent

reluctantly accept 

grudgingly accept 

blindly / unquestioningly accept 

accept sth at face value

morally / ethically acceptable

prove acceptable (none of the solutions proved acceptable)

a freak accident

a hit-and-run accident

a head-on collision

a multiple pile-up

purely / completely accidental

unintentional humor / irony

unintended consequence / impact / outcome

inadvertent error / omission / use

give an account of

write an account of