Race Comment Explainer

Original comment with matches highlighted:

held up in soon, idden a into midfield 3 out, soon ridden and no impression, tailed off before last

Matched phrases & meanings

Phrase	Meaning
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.
Headway	The horse was moving up through the field.
Rear	Running near the back of the field.

Summary

A definitive statement that the horse was finished and effectively out of the race
Intentionally raced patiently at the back to save energy.
The horse was moving up through the field.
Running near the back of the field.