What's the difference between knot and hole?

[Knotty]

English Language Tests, Intermediate level

ESL/EFL Test #705 "English Slang Idioms (447)", question 3

"I don't think your brother was telling the whole truth about why he wasn't able to come over last night. I picked a huge ......... in his story and he didn't have any answer for it," Harvey said to Paul.

(a) seam
(b) knot
(c) spot
(d) hole

English Language Tests, Intermediate level

ESL/EFL Test #705 "English Slang Idioms (447)", answer 3

"I don't think your brother was telling the whole truth about why he wasn't able to come over last night. I picked a huge hole in his story and he didn't have any answer for it," Harvey said to Paul.

Correct answer: (d) hole
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Knot? What does this idiom mean -- pick a hole in his story? Thank you !

Knotty

[Skrej]

To pick a hole in a story means to find lots of small problems, or inconsistencies in a story and expose them to the point that it's obvious the story cannot be completely true.

Sometimes you may it it as 'poke a hole' instead of 'pick'. There, the idea is to poke small holes in the story until it falls apart. Too many holes in a wall, and it will fall!

A knot is something tied together. For example, to join two pieces of rope together, you have to tie a knot. A knot can also be a metaphor for a problem, that it several things have become twisted together, causing a problem.
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Native speaker but not a perfect speaker.
But completely fluent in over six million forms of Teflese.

[Lost_Soul]

There is also a term knothole and knot (related to timber)
You can use the www.images.google.com search to have the idea of what they look like.
http://www.tri-levelcoaching.co.uk/Portals/0/Through_A_Knothole.jpg
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Alex

How much upchuck would a woodchuck upchuck if a woodchuck could upchuck ?

(a guy from Russia)