bull vs board

[Filipp]

English Language Tests, Intermediate level

ESL/EFL Test #388 "English Slang Idioms (119)", question 10

"You need to slow down and think about what it is you're doing. You are going about this like a ......... at the gate. You are going too fast and are screwing up too much," Larry said to Luke.

(a) goose
(b) robber
(c) board
(d) bull

English Language Tests, Intermediate level

ESL/EFL Test #388 "English Slang Idioms (119)", answer 10

"You need to slow down and think about what it is you're doing. You are going about this like a bull at the gate. You are going too fast and are screwing up too much," Larry said to Luke.

Correct answer: (d) bull
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what does board mean?

Filipp

[Mister Micawber]

.
BOARD
.
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Native English teacher at Mister Micawber's

[Xavierka]

Shouldn't be: too much?
Honestly speaking, I can't see the relation between doing someting quickly and a bull at a gate --but never mind.
It's a very good and useful website. Great thanks to all its inventors.