What does brood mean?

[Liguz]

English Language Tests, Intermediate level

ESL/EFL Test #240 "Confusing Words test (14)", question 7

Many years ago, most working dogs were ......... to train for certain tasks well.

(a) bred
(b) brood
(c) bread

English Language Tests, Intermediate level

ESL/EFL Test #240 "Confusing Words test (14)", answer 7

Many years ago, most working dogs were bred to train for certain tasks well.

Correct answer: (a) bred
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what does brood mean

Liguz

[Sindhb]

children, offspring[n]; worry[v]; // why brood over something so insignificant?