Race Comment Explainer

Original comment with matches highlighted:

in rear, plugged on into 4th after 3 out, quickly

Matched phrases & meanings

Phrase	Meaning
Plugged on	Kept going without showing much pace.
home turn	This is the final bend or corner of the track, just before the horses enter the final straight run to the finish line.
Weakened	The horse lost speed and dropped back through the field.
Rear	Running near the back of the field.

Summary

Kept going without showing much pace.
This is the final bend or corner of the track, just before the horses enter the final straight run to the finish line.
The horse lost speed and dropped back through the field.
Running near the back of the field.