Synonyms of 'interject'
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If you interpolate a comment into a conversation or some words into a piece of writing, you put it in as an addition.
He interpolated a lot of spurious matter into the manuscript.
If you interpose, you interrupt with a comment or question.
`He rang me just now,' she interposed.
Thesaurus for interject from the Collins English Thesaurus
If you interject something, you say it and interrupt someone else who is speaking.