What does the phrase 'I'm at the end of my tether at work' mean?

[Vaida]

English Language Tests, Intermediate level

ESL/EFL Test #706 "English Slang Idioms (448)", question 5

"I'm at the ......... of my tether at work. If the boss yells at me one more time for someone else's mistake, I'm going to get up and walk out," Jerry said to Phil.

(a) back
(b) front
(c) top
(d) end

English Language Tests, Intermediate level

ESL/EFL Test #706 "English Slang Idioms (448)", answer 5

"I'm at the end of my tether at work. If the boss yells at me one more time for someone else's mistake, I'm going to get up and walk out," Jerry said to Phil.

Correct answer: (d) end

Your answer was: incorrect
"I'm at the back of my tether at work. If the boss yells at me one more time for someone else's mistake, I'm going to get up and walk out," Jerry said to Phil.
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what does this phrase mean? i am at the end of my tether

Vaida

[Linda]

It's an idiom that means a person is extremely frustrated and no longer has the patience or the will to deal with or manage the thing/person that is causing the frustration.
The word tether is a rope that is used to prevent animals from wandering around.
Exact definition: "something (as a rope or chain) by which an animal is fastened so that it can range only within a set radius."
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