〜きりがない
there's no end to it
ば-form / たら / と + きりがない
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きりがない means something could go on forever: 心配すればきりがない, "if you start worrying, there's no end to it". きり is "limit" or "end", from 切る, so it's "there's no cut-off point".
It usually follows a conditional (ば, たら, と) describing something that could be repeated or listed without limit: complaining, worrying, listing wants, comparing yourself with others.
It's often used to justify stopping: 細かいことを言えばきりがないので、この辺で終わります, "I could go on about the details forever, so I'll stop here".
It's often written 切りがない, and in casual writing キリがない.
Examples
心配すればきりがない。
If you start worrying, there's no end to it.
文句を言い出したらきりがない。
Once you start complaining, there's no end to it.
欲しい物を数えたらきりがない。
If I listed everything I wanted, I'd never stop.
上を見ればきりがない。
If you compare yourself with those above you, there's no end to it.
細かいことを言えばきりがないので、この辺で終わります。
I could go on about the details forever, so I'll stop here.