English Mania

English Mania

http://blog.ted.com/2009/05/26/the_worlds_engl/

Idiom: To let somone down:
http://idioms.thefreedictionary.com/let+down

let someone or something down

Fig. to fail someone or something; to disappoint someone or a group. Please don't let me down. I am depending on you. I let down the entire cast of the play.

See also: let

let someone down

to disappoint someone; to fail someone. I'm sorry I let you down. Something came up, and I couldn't meet you. I don't want to let you down, but I can't support you in the election.