pen ‧ knife /ˈpen-naɪf/ BrE AmE noun ( plural penknives /-naɪvz/) [countable]
a small knife with blades that fold into the handle, usually carried in your pocket SYN jackknife
pen ‧ knife /ˈpen-naɪf/ BrE AmE noun ( plural penknives /-naɪvz/) [countable]
a small knife with blades that fold into the handle, usually carried in your pocket SYN jackknife
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012