A primitive root; (causatively) to make water, i.e. Urinate -- piss.
H8366. shathan
[שָׁתַן] verb Hiph`il urinate (secondary √ from above); — Participle בְּקִיר מַשְׁתִּין (i.e. a male person) 1 Samuel 25:22, 34; 1 Kings 14:10; 16:11; 21:21; 2 Kings 9:8 (all of exterminating a family).
שׁיר (√ of following, compare NöZMG xxxvii (1883), 537).