trainer noun
1 person who trains sb/sth
ADJ. orchestral, teacher | boxing, etc. | animal, dog, horse, racehorse | champion, winning | personal, private He works out every morning with his personal trainer. > Note at JOB
2 (usually trainers) sports shoe
QUANT. pair
VERB + TRAINER lace up, unlace > Special page at CLOTHES
You can also check other dicts: trainer (English, 中文解释 ), wordnet sense, Collins Definition