What can I call a person or a thing that is very small yet capable of defeating big giants?
I need different words that can be connected closely to this meaning.
It can be related to success,war, or anything else.
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David is often used in reference to David and Goliath.
Edit based on comments: They are right. It is all about context. In many contexts you would have to explain that the person is a David trying to bring down a Goliath. I have though seen the term David used alone when there is a build-up. If you were talking about someone trying to take out giants and said, "He will act like David with his slingshot..." There are tons of ways to do this. Was not implying that just simply mentioning the name David is proper, although some people would still get the inference.
Giant-killer is also used. It seems a bit on the nose, but it is used in that sense.
Small but mighty
Small but mighty
Small but mighty
When you're powerful and wise,
You can rise above any size
There is a rhyming version also: "tiny but mighty"
Bantam. Bantams are small but aggressive chickens. When stringent recruiting or conscription requirements were relaxed during the First World War, smaller men were allowed to join up. They were sometimes grouped together into units called Bantam Battalions. There's an interesting wiki article on them
PS 2 of them won the VC, the highest gallantry decoration in the British & Commonwealth armies: Sgt Albert Mountain VC and Pte William Boynton Butler VC. Both men were 5'1" tall.
Two words, but appropriate...Chuck Norris
A "Horatio Alger hero" would seem to match your "success" case.
The Horatio Alger Hero: Ragged Dick
In Ragged Dick Alger made a homeless orphan into a hero who became the prototype for the hundreds of heroes Alger created in the next thirty years. The novel covers the hero’s transformation from a ragged, homeless boy of the streets to a respectable clerk with a salary of ten dollars per week. Dick’s fortunes improve because he follows advice, works hard to acquire an education, and takes advantage of every opportunity. He also has the essential prerequisite to success—good character. The narrator describes Dick:
His stories all were based on someone coming from improbably poor/low/hard circumstances, and rising to positions of greatness, against all the odds.
("The Secret of my Success" was a modern version of this narrative.)
I would like to offer two different pop-culture words that work really well here too:
Rocky: Not only does he beat a giant every movie in the sense of sport but Rocky is a smaller boxer beating guys much bigger than him.
Usage - "Dude no way you are going to beat that guy. He is huge. Do you think you are Rocky?"
And on the complete opposite side of the word spectrum...
Cinderella: Just like the story Cinderella this would convey the small-time person or team that came out of no where to beat the powerful. Used in sports metaphors a lot. Used too much during NCAA tournament time.
Usage - "Wow. That high school only has 50 students in their senior class. If their basketball team wins the state tournament that would be a real Cinderella story.