Green’s Dictionary of Slang

e-fink n.

a knife.

1859		Hotten Dict. of Modern Sl. etc.
1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.
2001		J. Burkardt ‘Back Sl.’ Wordplay 🌐 eefink: knife.
2019		P. Baker Fabulosa 292/1: efink a knife.
2023		R. Milward Man-Eating Typewriter 54: [T]he spiv clocked the butchers’ efinks glimmering on the draining-board.