What does the slang expression "a hang-up" mean?

[Vicky Tordicelli]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #41 "American Slang Words (15)", question 1

Kevin and his family have had a rough time since the recent stock market crash.

(a) easy time
(b) hard time
(c) a lot to do

English Idioms and Expressions, Advanced Level

ESL/EFL Test #41 "American Slang Words (15)", answer 1

Kevin and his family have had a hard time since the recent stock market crash.

Correct answer: (b) hard time
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For american young people what does mean in slang the expression "hang up"

Vicky Tordicelli

[Mister Micawber]

.
hang-up
–noun Slang.
1. a preoccupation, fixation, or psychological block; complex: His hang-up is trying to outdo his brother.
2. a source of annoying difficulty or burden; impediment; snag: The most serious hang-up the project has is a shortage of funds.
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Native English teacher at Mister Micawber's