trainer
UK: ˈtreɪnə | US: ˈtreɪnər
n. a person who teaches or coaches skills, especially in sports or fitness
n. a type of shoe designed for sports or casual wear (chiefly British English)
n. a device or software used to teach or simulate a skill (e.g., flight trainer)
The word "trainer" derives from the verb "train," which originated from Old French "trainer" (to drag, pull, or draw) and Latin "traginare" (to drag). By the 16th century, "train" evolved to mean "to instruct or discipline," reflecting the idea of guiding someone toward improvement. The suffix "-er" (from Old English "-ere") denotes a person or thing performing an action, thus forming "trainer" to describe someone who trains others. The British usage for "sports shoes" (20th century) metaphorically extends the idea of aiding physical training.
The football team hired a new trainer to improve their fitness.
She bought a pair of lightweight trainers for her morning runs.
The flight trainer simulates real cockpit conditions for pilots.
His role as a corporate trainer involves teaching leadership skills.
The dog trainer uses positive reinforcement techniques.