trainer

Noun

trainer (plural trainers)

1. A person who trains another; a coach.
   • It was [Roger] Federer’s ability to pull him around the court that put the lactic acid and debilitating weight in those legs and he should not have been allowed the luxury of his trainer’s help.2012 June 29, Kevin Mitchell, “Roger Federer back from Wimbledon 2012 brink to beat Julien Benneteau”, in The Guardian, archived from the original on 15 Nov 2016

   Synonyms:

   coach

2. A person responsible for treating injuries sustained by players during matches; a physiotherapist.
   • He served Nelson wholeheartedly as a player, coach and trainer in a lengthy association, the highlights being his involvement in two championship-winning sides.2009, Garth Dykes, Nelson FC in the Football League, page 22
3. (Ireland, UK) A running shoe or sneaker.

   Synonyms:

   dap

4. (slang) A patch for a video game that applies cheats.
   • I actually never got a trainer for RCT, but needed one for my brother when I installed it on his computer. He is 10, and is only concerned with making "cool" coasters. I also completed CF before getting trainers.2000, Phil, “I need trainer for version 1.10.021”, in alt.games.rctycoon (Usenet)
   • Are there any sites that have original copies of games? (ie: Summer/Winter/World Games with Fast Loading). Just looking for games without the trainers/intros.2001, LJames4728, “Good C64 Game Sites?”, in alt.c64 (Usenet)
5. A piece of indoor equipment allowing a bicycle to be ridden while stationary.
6. A device for encouraging the roots of a plant to grow in a certain direction.
   • a root trainer