Learn English – How to use “stumbling block” in a sentence

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I'm a normal Korean uni student who's confused by this expression STUMBLING BLOCK.

I've googled this word so many times, and I have even looked that up in the dictionary. It defines the word as "a problem that prevents from achieving something". But can it be something like a hurdle?

I mean, I think this word is figurative. I mean, you cannot see it but we know we have our own OBSTACLE in our lives like finance problems, love, hatred, or things like that.

I'm having a debate with my English professor. He keeps saying Stumbling Block is visible, it's something that we can see. Like a building or the tree. But I think it's something we can't see, such as love, like, anger, or a language barrier.

And is the following sentence correct?

a stumbling block holds back water in a reservoir.

I said it's wrong because of use of stumbling block, but he says it's a correct sentence.

So please help me!

Best Answer

The word block can refer to

A lump of wood, stone, or other matter, that obstructs one's way.

(Oxford English Dictionary (OED)).

This refers to a literal lump of wood or stone that you can pick up or remove. According to the OED this usage of block now occurs only in the compound noun stumbling block.

For example, you could say

Watch out for those bricks in the road ahead. They might cause you to stumble or trip. They can be stumbling blocks for anyone who does not walk carefully here.

All this refers to actual physical bricks, which form actual physical stumbling blocks to people who might literally stumble over them. You can actually pick up the bricks (which form the literal stumbling blocks) and clear the path.

The word stumbling block does not normally refer to a physical block or stone.

The link above (Oxford Dictionary online) lists several example sentences. An example off the top of my head is

The growing cost of higher education forms a stumbling block to parents who wish to send several children to university.

Here stumbling block is used figuratively. And that is how it is usually used.

Common synonyms for stumbling block include obstacle and hurdle.

To insist that a stumbling block must be something we can see is wrong.

However, it can refer to something physical:

The pimple on my sweetheart's nose is a stumbling block to me asking her to get married.

but here it's the existence of the pimple that forms a stumbling block or obstacle in the mind of the speaker. It is a physical object that is forming a mental stumbling block to the speaker.

I am not sure what your professor means by

A stumbling block holds back water in a reservoir.

It seems that he is using or trying to use stumbling block in the literal sense, to refer to a literal block or lump of wood or stone or similar that impedes or obstructs the water's progress, so that a reservoir is formed. But stumbling block causes people to stumble, not water or other "inanimate objects."

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