for your sins

for your sins

used to suggest that a task or duty is so onerous or unpleasant that it must be a punishment. chiefly British
1994 John Birmingham He Died With Felafel In His Hand Then the extended family that is Brisbane sent some people along to keep me company, and for my sins, I took them in.
See also: sin

(do/be something) for your sins

(spoken, humorous, especially British English) be/do something as a punishment: ‘I hear you’re going to be the new manager.’ ‘Yes, for my sins.’
See also: sin