622.22  Understanding of parties to agreement.
  When the terms of an agreement have been intended in a different sense by the parties to it, that sense is to prevail against either party in which a party had reason to suppose the other understood it.
[C51, §2401; R60, §3994; C73, §3652; C97, §4617; C24, 27, 31, 35, 39, §11275; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §622.22]