Noun

(en noun)

A person with extensive knowledge or ability in a given subject.

* If an expert''' says it can't be done, get another '''expert . -

* {{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)

, title= Welcome to the plastisphere , passage=Plastics are energy-rich substances, which is why many of them burn so readily. Any organism that could unlock and use that energy would do well in the Anthropocene. Terrestrial bacteria and fungi which can manage this trick are already familiar to experts in the field.}}

(chess) A player ranking just below master.

Noun

(en noun)

A person who trains another; a coach.

* {{quote-news

, year=2012 , date=June 29 , author=Kevin Mitchell , title=Roger Federer back from Wimbledon 2012 brink to beat Julien Benneteau , work=the Guardian citation , page= , passage=It was 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.}}

(sports) A person responsible for treating injuries sustained by players during matches; a physiotherapist.

* 2009 , Garth Dykes, Nelson FC in the Football League , page 22:

He served Nelson wholeheartedly as a player, coach and trainer in a lengthy association, the highlights being his involvement in two championship-winning sides.

(British) A running shoe or sneaker.

(video games, slang) A patch for a video game that applies cheats.

* 2000 , "Phil", I need trainer for version 1.10.021'' (on newsgroup ''alt.games.rctycoon )

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.

* 2001 , "LJames4728", Good C64 Game Sites?'' (on newsgroup ''alt.c64 )

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.