—trainer /ˈtreɪ.nər/ aep /-nɚ/
noun [C usually plural] UK (UK ALSO training shoe, US sneaker) (SHOE)
► A2 a type of light, comfortable shoe that is suitable for playing sportSee picture: (UK) trainers/(US) sneakers 
Thesaurus+: ↑Shoes and shoemakingThesaurus+: ↑Sportswear and swimwear
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Extra Examples:» Trendy trainers and designer labels have become aspirational status symbols, especially among the young.» Please wear trainers in the gym, to avoid scuffing the floor.» He's got some wicked trainers.noun [C] (PERSON)
► B1 a person who teaches skills to people or animals and prepares them for a job, activity, or sport: » They showed pictures of the horse and its trainer (= the person who prepared it for its races).» A lot of wealthy people have their own personal trainer (= a person they employ to help them exercise).Thesaurus+: ↑TeachersWord Builder:–Nouns: trainee, trainer, training, retraining–Adjectives: untrained–Verbs: train• • •
Extra Examples:» Her new trainer has promised to make an olympic athlete of her.» She hired a trainer to create a personalized exercise schedule to get her into shape.» Her trainer is a triple Olympic champion.» The horse has had a new trainer for the last six months.» He works as a trainer for insurance company staff.