Race Comment Explainer

Original comment with matches highlighted:

held up in last pair, pushed along 3f out, soon off and ,

Matched phrases & meanings

Phrase	Meaning
Pushed along	The jockey started to urge the horse (hand-riding, not necessarily using the whip).
tailed off	A definitive statement that the horse was finished and effectively out of the race
Weakened	The horse lost speed and dropped back through the field.
Outpaced	Could not keep up with faster horses mid-race.
Held up	Intentionally raced patiently at the back to save energy.

Summary

The jockey started to urge the horse (hand-riding, not necessarily using the whip).
A definitive statement that the horse was finished and effectively out of the race
The horse lost speed and dropped back through the field.
Could not keep up with faster horses mid-race.
Intentionally raced patiently at the back to save energy.