While there are instances which seem to indicate oaths and curses can't be recalled, there is an interesting passage in The Silmarillion in "Of The Flight of The Noldor" which seems to hint that it could.
"...all heard the curse that was uttered upon those that would not stay nor seek the doom and pardon of the Valar ."
And
"Feanor hardened his heart and said: 'We have sworn, and not lightly. This oath we will keep."
These seem to suggest the possibility of having an oath invalidated.
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