立字lì∥zì(～ㄦ{lì∥zìr})写下字据{sign an agreement, a contract, a receipt, a written statement, etc.}: 借钱得立个字{A written statement must be signed if you want to borrow money.}|空口无凭,～为据。{A verbal statement is no guarantee; a written piece must be signed as evidence.}