also: じっとくナイフ
multipurpose knife; Swiss Army knife
Refers to a folding knife with multiple tools, often modeled after the Swiss Army knife. 十徳 literally means 'ten virtues' or 'ten functions'.
It's handy to bring a Swiss Army knife when camping.
He opened the can with a multipurpose knife.
Alternate reading; じっとく is a common variant of 十徳.
十徳 (じゅっとく/じっとく, 'ten virtues/functions') + ナイフ ('knife'). The term 十徳 originally referred to a multi-purpose tool or a person with many skills, and here it describes a knife with many built-in tools.