Blunt everyday word for urine or the act of urinating. It can sound coarse or impolite; 尿 is more formal or medical, and おしっこ is softer or child-directed.
noun, noun or participle which takes 'suru', intransitive verb
breaking a contract; backing out of a deal
colloquial
Colloquial and specialized use meaning to break or back out of a contract. This is not a normal business or legal term; 契約違反 or 契約を破る is safer in ordinary speech.