Orwell had a job with the British Ministry of Information during WWII. Part of his job was translating news reports into 850-word Basic English [1] for radio broadcasts to the Colonies. (India, mostly.) Once you know that, this essay, and "1984", make more sense. Orwell discovered that translating into Basic English is a political act. The evasions and prevarications of official statements do not translate. Ambiguity has to be hammered out first to fit into the forced plain style of Basic English. Hence, Newspeak.
His list of overused phrases is dated. A few to avoid today:
- "very unique". "Unique" means there's only one. If there's more than one, "unique" is the wrong word.
- "a lot". Overused, but harmless.
- "literally". Avoid unless "literally" is true; do not use for emphasis.
[1] https://en.wiktionary.org/wiki/Appendix:Basic_English_word_l...