All 8 Uses

accord
in
Watership Down
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But at this moment the other rabbit came toward them of his own accord.
p. 63.5

own accord = own mind -- voluntarily (without anyone asking)
He came of his own accord.
p. 65.3
Hazel went out of his own accord, to distract their attention while we got away.
p. 223.8 *

own accord = own mind (voluntarily without anyone asking)
"I think many things are left out, if only the truth could be known," said Dandelion, "for no one can say what happens in that country where El-ahrairah went of his own accord and we do not."
p. 273.3

own accord = own mind -- voluntarily (without anyone asking)
He was no fool and it was, he could not help feeling, extremely odd that any right-minded rabbit should choose to walk into Efrafa of his own accord.
p. 311.6
Nelthilta, however, stopped of her own accord and stared impudently at him.
p. 344.2
Finally, when he was utterly at a loss, it set off over the field of its own accord, padding easily along beside one of the rows of threshed straw, trailing the broken cord and pouncing in and out at every squeak and rustle.
p. 446.8
Of their own accord they could no more run to the hills than fly to the moon.†
p. 216.5

Definitions:

(1) (accord as in: according to, or in accord with)
in keeping with; or in agreement/harmony/unity with
This meaning of accord is often seen in the form according to or accordingly where it can take on more specific meanings. For example:
- "According to Kim, ..." -- as stated by
- "To each according to her ability." -- based upon
- "Points are scored according to how well they perform." -- depending upon
- "The dose is calculated according to body weight." -- in proportion to
- "We got a flat tire. Accordingly, I pulled to the side of the road." -- because of what was just said; or as a result
(2) (accord as in: reached an accord)
an agreement

In this sense, accord can refer to a formal agreement (such as one written between two countries) or an informal agreement (such as an unvoiced consensus about what should be done).
(3) (accord as in: done of her own accord)
mind

This sense of accord is typically seen in the form own accord or one accord.
(4) (accord as in: accord her the respect deserved)
to give someone special treatment -- especially respect
(5) (meaning too rare to warrant focus)