Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
porceo (PORXI, acc. to Charis. p. 217 P., without any example). 2, v. a. [porro-arceo], to keep off, keep back, to hinder, restrain (ante-class.): porcet quoque dictum ab antiquis quasi porro arcet, Paul. ex Fest. p. 15 Müll.: porcet significat prohibet, Non. 159, 33: non te porro procedere porcent, Lucil. ap. Non. 160, 9: civium porcet pudor, Enn. ap. ib. 160, 6 (Trag. v. 369 Vahl.); Varr. ap. ib. 160, 8; Pac. and Att. ap. ib. 160, 2 and 5.