big snip
n.— «The choral tradition has seen a preference for male alto voices.…With few volunteers for “the big snip” these days, they also make convenient stand-ins for the castrato voice—all the rage in vocal music of the baroque to early classical era—while lacking the penetration, power and high notes of these neutered men.» —“Classical CDs” Daily Yomiuri Dec. 8, 1998. (source: Double-Tongued Dictionary)