Explanation
Indicates an endless or unending cycle once an action is started; 'if one starts doing something, it will not stop.'
Formation
Verb-た form + ら + きりがない
Detailed explanation
The たらきりがない grammar pattern is used when something negative or undesirable continues indefinitely once it begins. The implication is that you should avoid initiating the action because it’ll just go on and on.
Examples
Kono enjin o shuuri shitara, mata sugu kowarete, naoshitara kiri ga nai.
If I fix this engine, it breaks again, and if I fix it again, it never ends.
Nomihajimetara kiri ga nai.
Once I start drinking, I never stop.
Kanojo ni okane o kashitara, kiri ga nai.
If I lend her money, there will be no end to it.
Kare no hanashi o kikihajimetara kiri ga nai.
Once you start listening to his stories, it never ends.
Practice
Grammar content sourced from hanabira.org.