Undermine: (v) to gradually make someone or something less strong or effective
Synonym: destabilize
Antonym: bolster
Sentence: I felt like my authority was undermined when my boss excused the worker's behavior.
We are middle school English educators with a voracious appetite for all things vocabulary. We hope you will be delighted by our nerdy love of words, English, grammar, and ideas for the classroom! Follow our blog and our updates on Twitter to keep up with our nerdiness. Check out our products on Teachers Pay Teachers and Teacher's Notebook to get lessons and activities you will be ecstatic about implementing.