Undermine
— to weaken gradually; to sabotage
Undermine means to weaken or damage something gradually, often from within or from a hidden position. It can apply to physical structures — literally digging beneath a foundation to make it collapse — or, far more commonly, to abstract things like authority, confidence, trust, or efforts.
What makes undermining particularly effective and dangerous is its gradual, often invisible nature. A person who undermines a colleague does so subtly — through quiet sabotage, strategic gossip, or small acts of non-cooperation — rather than through open confrontation. The damage accumulates over time until the structure or system finally gives way.
Do you know what Undermine means?
Answer a question to start building your vocabulary.
Memory Mnemonic
UNDER MINE
The keyword UNDER MINE comes directly from how Undermine is spelled. This spelling connection makes it easy to recall the keyword whenever you see the word.
Memory Link
They dug tunnels UNDER the MINE to collapse it slowly—weakening gradually and sabotaging the structure!
Picture workers digging tunnels UNDER a MINE, hollowing out the ground beneath it so the entire structure weakens and slowly collapses from below — sabotaged from a position no one can see. UNDER MINE gives you the keyword, and the image of a structure being secretly weakened from beneath captures the meaning of undermine perfectly. Visualise the mine's support beams cracking one by one as the earth is removed from under them, the whole thing sagging before it finally caves in.
HOW TO MEMORIZE VOCABULARY
There are 3 steps to effectively memorising vocabulary.
Step 1: Derive a keyword from the word based on how the word is spelled or pronounced. Next time you see the word, you will be able to derive the keyword from it because it is based on the word.
Step 2: Form a visual memory link that connects the keyword and the meaning(s) of the word you are learning.
Step 3: Ensure to Visualise the image, see it in your imagination. This is important even if it takes a few seconds.
Usage Examples
- Constant criticism from her manager slowly undermined her confidence in her own abilities.
- The leaked documents undermined public trust in the government's handling of the crisis.
- Flooding had undermined the foundations of the bridge, making it unsafe for traffic.
- His habit of contradicting her in meetings was clearly an attempt to undermine her authority.
- Years of corruption had undermined the institution to the point where reform seemed impossible.
Etymology of Undermine
From Middle English underminen, literally meaning "to dig beneath" — from under + mine (to dig tunnels). The military practice of digging tunnels under enemy fortifications to collapse them gave rise to the figurative sense of secretly weakening or eroding something from below.
Synonyms & Antonyms of Undermine
Synonyms
Antonyms
Common Collocations with Undermine
You've Learned It. Now Make Sure You Never Forget It.
The mnemonic visualisation above helps you learn this word instantly — no rote memorisation needed. But to move it into long-term memory, you still need to review it a few times.
This is where spaced repetition comes in — it shows you words right before you're about to forget them, so you spend less time reviewing and remember more. After just a few spaced reviews, you'll start recalling the meaning naturally — without even needing the keyword or memory link.
Built In Spaced Repetition
You've learned this word using our mnemonic system — but to truly lock it into long-term memory, you need to review it at the right time. That's where spaced repetition comes in.
Our built-in spaced repetition system shows you words just before you're about to forget them, so you review less and remember more. After a few reviews, you'll recall the meaning naturally — without even needing the keyword or memory link.
Explore Word List
You can explore the Word List for a pack from the dashboard. Once you have selected a pack, just clicks Words
Visualisation Help
Visualising the memory link is the most important step — it's what makes you remember the word on the very first try. Don't just read the memory link. Close your eyes and see it play out in your imagination.
The more vivid and detailed your mental image, the stronger the memory. Every word on VocabularyFast comes with a visualisation audio guide. Just look at the image, hit play, and follow the audio as it walks you through the scene.
This takes only a few seconds but makes all the difference between forgetting a word tomorrow and remembering it for life.
Test Yourself With Quizzes
Quizzes are the fastest way to check if you've truly learned a word. Pick from two modes — see the word and recall the meaning, or see the meaning and recall the word.
Both directions strengthen your memory in different ways. Each quiz is 10 questions, so it only takes a minute or two. Take a quiz anytime to quickly spot which words need more review.
Learn In Focused Groups
Words in each pack are organized into smaller, meaningful groups — not random lists. Each group contains words that share a theme, difficulty level, or frequency of appearance.
This lets you focus your learning on the words that matter most, rather than jumping between unrelated words. Start with the most commonly tested words and work your way through each group at your own pace.
Ready to boost your vocabulary?
Build Vocabulary Now