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4.
French for "let's go." More formal than "on y va" (literally "one goes there") which means the same thing.

Well-known from the phrase "Allons-y, Alonso" (Alonso is a name). Made famous in English by the tenth doctor on Doctor Who though he was actually quoting the character Ferdinand in the '60s French film Pierrot le fou, where the subtitles translate it as "let's go, daddy-o."
Ferdinand: Allons-y, Alonso.
by frankchie November 11, 2012
 
1.
In French, allons-y stands for "let's go."

This phrase is often used by the Tenth Doctor in Doctor Who.
Tenth Doctor: "Allons-y, Alonso!"
by novitas May 23, 2008
 
2.
is an old Earth saying, a phrase of great power and wisdom and consolation to the soul in time of need.
ALLONS-Y ALONSO!
by njmmagician February 02, 2010
 
3.
French meaning "Let's Go". Coined by the Tenth Doctor in the British tv show "Doctor Who".
Doctor: "What's you're first name?"
Alonso: "Alonso".
Doctor: "You're kidding me".
Alonso: "What?"
Doctor: "That's something else I've always wanted to say".
Doctor: "Allons-y Alonso!!"
by mabiniss2 November 19, 2010