noun
pacer
noun
1
Someone or something that sets the pace, especially in a race.
"The elite runner served as a pacer for the marathon's early miles."
2
A horse trained to move both legs on one side together, a gait used in harness racing.
"The pacer pulled ahead in the final stretch of the race."
How to Use Pacer
Learner’s notesIn plain EnglishSomeone (or a horse) that sets the speed for a race, or leads at a controlled pace.
Word Forms
pacers plural, pacers plural, Pacers plural
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The elite runner served as a _____ for the marathon's early miles.
Etymology
From "pace" plus the agent suffix "-er."