Dashed off without son and behaved abjectly (7)

I believe the answer is:

crawled

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'dashed' is the definition.
The definition and answer can be both to do with motion as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for crawled that I've seen before include "Went on hands and knees" , "Moved along with the body near the ground" , "Crept" , "Travelled very slowly" .)

I've seen this clue in The Telegraph.

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