BT San 7a(19) :דאמי לגודא דגמלא כיון דקם קם‏ : (a quarrel) is like the planks of a bridge. When they have stabilized they remain so
See the entire entry for gyd#3 n.m. bridge planking

BT San 7a(19) :האי תגרא לא דאמי אלא לצנורא דבדקא כיון דרוח רוח‏ : a quarrel is just like the channel of a sluice: When it becomes wide it stays wide
See the entire entry for rwḥ#2 vb. to be spacious