(an act of) arresting a thief etc

taking into custody

a formal agreement (between people, groups, states)

agreement, deal

a formal agreement that is legally binding

pact, promise

a payments which must be, but has not yet been, paid to a person

money owed to others

something a person must do because of morality, law, conscience etc

responsibility, assignment

an agreement to marry

pledge to marry

a mitten; a hand; fist

taking into custody

something that it is essential to see, do, hear etc; (used to express an obligation or an order)

necessity, essential

a condition, fact, of feeling that something necessary is absent; things considered to be necessary; misfortune, bad circumstance

want, requirement

a promise, duty or condition that shows what action ought to be taken (e.g. the law, one's duty, a sense of what is right)

responsibility

(used to tell a person about a present or past duty or obligation) (used to express an opinion, give advice etc about the present or past)

necessity, essential

a written or spoken serious statement or agreement (not) to do, give etc

one's word that something will be done