what does "fly off the handle' mean?

[Mors]

English Language Tests, Intermediate level

ESL/EFL Test #351 "English Slang Idioms (72)", question 2

"The sermon was one of those ......... speeches that don't teach you anything of substance," Gracie told Silvia.

(a) flowery
(b) gratuitous
(c) extra
(d) certain

English Language Tests, Intermediate level

ESL/EFL Test #351 "English Slang Idioms (72)", answer 2

"The sermon was one of those flowery speeches that don't teach you anything of substance," Gracie told Silvia.

Correct answer: (a) flowery
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what does "fly off the handle' mean?

Mors

[Mister Micawber]

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THIS is a good dictionary to use.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber