Forgot to tick the box ....

So are we dropping it or not? It was just approved.

OK, drop it. WWWJDIC's glossing function handles it OK. I've added it to my text-glossing file.

i agree with Robin that it's probably not needed

For people (and esp. beginners) using tools like rikai-kun etc., I think it's convenient to be able to pick this up in one sweep and 
immediately provide an idiomatic translation instead of forcing them to puzzle out what the constituent parts mean on their own, and 
it's useful for reverse look-ups and possibly Japanese users looking for how to say 外で飼う in English (it probably won't take long 
before a google search for 外で飼う　英語 brings up the weblio page including this definition as the first result). Also in general if it 
really is an idiomatic expression (and in another source; even if it's eij), I think entries like these are basically harmless to 
include - there are no obvious downsides and you never know in what ways it might be useful (machine translation?)