The Collaborative International Dictionary
Supplement \Sup"ple*ment\, v. t. [imp. & p. p. Supplemented; p. pr. & vb. n. Supplementing.] To fill up or supply by addition; to add something to.
Causes of one kind must be supplemented by bringing to
bear upon them a causation of another kind.
--I.
Taylor.
Wiktionary
vb. (present participle of supplement English)
Usage examples of "supplementing".
Biochemical devices were grafted on to glands and circulatory networks, supplementing organ functions.
An escort flight is very different from supplementing planetary defences.
Rubra’s regiment of descendants all knew about the visitor, and had been surreptitiously supplementing their armaments ever since.
Question: Should we actually teach English, or settle for supplementing Erendra vocabulary?