There are already questions on disabling flyspell (see: https://stackoverflow.com/questions/3423638)
However I would like to toggle flyspell at runtime.
An annoyance I've found is the red-underline persists, even once flyspell has been disabled.
Closing and opening the file refreshes, but that's impractical.
(turn-off-flyspell) (flyspell-mode 0) ;; force refresh of highlighting (doesn't work) (font-lock-fontify-buffer)
Is there a way to clear underlined text?