BT Git 67b(26) :וליחות וליקו׳ ^במיא^ עד דחליש ליה עלמא‏ : he should go down and stand in the water until he feels faint
See the entire entry for ḥlš#2 vb. to be weak, to be sick

BT Git 67b(26) :ולימוד וליסק ולייתיה‏ : he should submerge himself, ascend, and come out
See the entire entry for ˁmd vb. to sink; be baptized