Cases of word usage

1) to carry out (a task, duty, promise etc) (fulfill)

2) a formal promise or agreement that certain conditions agreed (e.g. when one buys something) will be fulfilled (guarantee)

3) a tool or instrument used for doing work; to carry out (an undertaking, agreement, promise etc) (implement)

4) to give up, send away, (a person) after giving her or him encouragement or a promise to marry (jilt)

5) a solemn promise to do something; a solemn statement (e.g. in a law court) that something is true (oath)

6) a prisoner's solemn promise that he or she will not repeat a crime (parole)

7) (something that provides) safety, freedom from danger or anxiety; something valuable, e.g. a life insurance policy, given as a guarantee for the payment of a loan or the fulfilment of a promise etc (security)

8) to use bad, obscene, language; to state or promise (something) seriously and formally (swear)

9) to make (a person) make a solemn promise (sworn)

10) not true (to one's duty, a promise etc); committing adultery (unfaithful)