Race Comment Explainer

Original comment with matches highlighted:

held up in er 4, mistake 5th, pushed along after 4 out, from 3 out

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
Held up	Intentionally raced patiently at the back to save energy.
Rear	Running near the back of the field.

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
Intentionally raced patiently at the back to save energy.
Running near the back of the field.