So, I was watching an anime, whereupon I found the following text (cf. screencap):
This text appears in the context of the character 夜ト trying to find work. I'm having difficulty figuring out what 春夏冬 means. If you just glue the on readings for those three characters together, you get しゅんかとう, which only seems to appear as the name of various establishments. I also found that this can apparently be read in a punny way as あきない (since 春夏冬 is all the seasons but 秋).
I'm guessing that the correct reading of 春夏冬 in this context is あきない since しゅんかとう doesn't fit. But what does that actually mean? I doubt it's 秋がない / 秋ではない / "not autumn", given that that doesn't make sense in context.
This term doesn't seem to appear in any of the standard online dictionary searches (kotobank, goo.ne.jp, weblio, nor even in zokugo-dict), so I'm kind of at a loss here.