Give (one) enough rope to hang (one)self phrase
To allow someone to continue doing something wrong or harmful to themselves and then suffer the consequences of such a way of acting.
I knew he cheated on his wife but gave him enough rope to hang himself.
A: Should I tell the teacher that Mary is cheating? B: No. Give her enough rope to hang herself.
When the police stopped asking me and let me keep talking, I felt like they were giving me enough rope to hang myself.
The verb "give" must be conjugated according to its tense.
This phrase dates back to the mid 17th century.
Used when something unpleasant has happened that has spoilt what you intended to do
Oh, no, that’s torn it! I’ve left my wallet at home!