MG 18:56.1.37 :איתיבא לה פורתא בכרעה ושכיב‏ : some excrement (a play on פורתא "little bit") got stuck in her leg and she died
See the entire entry for ytb vb. to sit ; to dwell; to stay, remain

MG 18:56.1.37 :איזי איבקי דלמא משכח אנא פורתא דמדעם אכילנא‏ : let me go and search, maybe I'll find a bit of something that I can eat
See the entire entry for purtā n.m. portion, small amount