This one’s a super Mexican way to suggest a backup plan, especially when you're thinking out loud or just vibing with a pal.
It means something along the lines of:
👉 Or if not, we can just…
👉 Or otherwise, we could just…
Oh, and it’s also used to float theories as to WHY something happened:
➡️ Or if not, maybe it was…
💡In Mexican Spanish igual has loads of different functions (and will make you sound WAY more native if you start using it!).
In this particular chunk, it adds a laid-back, speculative tone.
🌪️ When to whip it out
Whenever you're casually suggesting an alternative plan:
O si no, igual nos echamos unas chelas en tu casa.
Or if not, we can just have a few beers at your place.
Vamos a comer algo… o si no, igual te caigo más tarde.
Let’s go eat something… or if not, I’ll just drop by later.
Or when speculating about a possible ulterior motive or cause:
O si no, igual faltó al trabajo porque lo suspendieron…
Or maybe he missed work because they suspended him…