2. fraudulent   adjective   

原句: If fraudulent charges show up on a credit card bill, the cardholder can simply refuse to pay them.

意思: intended to cheat sb, usually in order to make money illegally

字源: late Middle English: from Old French, or from Latin fraudulentus, from fraus, fraud- ‘deceit, injury’. 

例句: Steps are being taken to crack down on fraudulent advertising.

3. federal   adjective   

原句: Federal law limits credit card holders' liability to $50 of fraudulent charges.

意思: (within a  federal system , for example the US and Canada) connected with national government rather than the local government of an individual state

字源: mid 17th cent.: from Latin foedus, foeder- ‘league, covenant’ + -al. 

例句: We will continue federal funding for the arts.

4. reimburse   verb   

原句: Which means the consumer must fight to get the funds reimbursed.

意思: to pay back money to sb which they have spent or lost

字源: early 17th cent.: from re- ‘back, again’ + obsolete imburse ‘put in a purse’, from medieval Latin imbursare, from in- ‘into’ + late Latin bursa ‘purse’. 

例句: Any costs that you incur will be reimbursed in full.

5. refund   noun   

原句: Debit cardholders have to battle for a refund.

意思: a sum of money that is paid back to you, especially because you paid too much or because you returned goods to a shop/store

字源: late Middle English (in the senses ‘pour back’ and ‘restore’): from Old French refonder or Latin refundere, from re- ‘back’ + fundere ‘pour’, later associated with the verb fund. The noun dates from the mid 19th cent. 

例句: She received a refund on the unused tickets.