Clive Dixon claimed the kitchen knife was to be used for peeling vegetables.
At Peterborough Magistrates’ Court on Monday, the 46-year-old pleaded guilty to possessing a knife blade in a public place.
It happened outside a city branch of Lloyds on August 14, 2020.
Prosecutor Peace Egbulefu said police attended an incident involving the defendant.
Dixon was arrested following a search and in interview admitted to having the knife in the waistband near the small of his back.
Miss Egbulefu added: “The defendant said the reason for having it there was to prevent him putting holes in his pocket.
“He said he was not aware that it was an offence. He was taking the knife to his partner’s to cut vegetables.”
Solicitor Kashif Khan said it was a “somewhat unusual account” and with two other people involved in the original incident, it “clearly crossed” the custody threshold as the sentencing starting point. He asked the magistrates to consider a pre-sentence report.
The bench agreed and the case was adjourned to July 26.
Dixon, of Goffsmill, was granted unconditional bail to the next hearing.