Verb (5-dan, ぶ, intransitive)
1.  to fall down;  to fall over
2.  to turn out;  to play out
oft. as どう転んでも
when read as "ころぶ"
3.  to abandon Christianity (and convert to Buddhism);  to apostatize
in early Japanese Christianity
when read as "ころぶ"
4.  to roll;  to tumble
5.  (for a geisha) to prostitute (herself) in secret