P / pī^gresco
verb intransitive

pī^gresco

2nd PP pī^grescĕre · conj. 3rd
to become slow; sluggish
v. inch. n. [pigreo], to become slow, sluggish: Nilus pigrescit, Plin. 18, 18, 47, § 168: possit pigrescere Cyllenius, Mart. Cap. 1, § 38; Ambros. Virg. 17, 110; id. in Luc. 10, § 23.