verb/de.ʁɛ̃.ɡaʁ.di.ze/
to make un-outdated; to make something outdated be in fashion again
“Le président Emmanuel Macron est déterminé, semble-t-il, à «déringardiser» la langue française” — It appears that President Emmanuel Macron is determined to make the French language "un-outdated"
From dé- + ringardiser.