s/uddha-pra^yas/cittika梵语s/uddha-pra^yas/cittika。为‘舍堕’之对称。乃单对他人忏悔即可得清净之堕罪。又称单提。系波逸提之一种。单堕之戒数,诸律所出稍异,且比丘、比丘尼所持之戒数与戒条之顺序亦不同。据四分律所说,比丘有九十单提法,故一般亦常称单堕为‘九十单提。另据智首之四分律疏卷九载,十诵律所列举之比丘单堕法亦为九十条,然无四分律中之‘不受谏’条,而别有‘不恭教说法教诫人’一条。五分律所列举之比丘单堕法有九十一条,亦即缺四分律之‘不受谏’条,又将四分律之‘用虫水’、‘饮虫水’二条合为一条,然别有‘入尼寺为无病尼教说法’、‘轻三师’、‘回僧物与别人’等三条。摩诃僧祇律所载比丘单堕有九十二条,解脱戒经、有部毗奈耶杂事等则与四分律同为九十条,然戒条项目略异。