subfuscare Save DMLBS subfuscare [CL subfuscus+-are], to darken, make somewhat black. b (transf.) to cause to grow dark, to deprive of clarity. cutis ~atur Gilb. VI 258. 1. b 1281 quod ne forsan tractu temporis ~ante memoriam ‥ in dubium revocari possit ‥ Ch. Sal. 358.