Longman Dictionary of Contemporary English - decide

~ v 1 to make a choice or judgment about something, especially after a period of not knowing what to do or in a way that ends disagreement  (decide to do sth)  (Tina's decided to go to Prague for her holidays. | decide that)  (It was eventually decided that four London hospitals should be closed. | decide who/what/how etc)  (I can't decide what to do. | decide whether/if)  (Women now have greater freedom to decide whether or not to get married.) + between  (I'm trying to decide between the green and the blue for the bathroom.) decide sth  (I'm eighteen now - I have a right to decide my own future. | decide for yourself (=make your own choice or judgment, without asking anyone else to do it for you))  (You must decide for yourself whether to leave college.)  (- see also decision (1)) 2 to be the reason for someone making a particular judgment or choice  (decide sb to do sth)  (What was it that finally decided you to give up your job? | deciding factor (=a very strong reason that forces you to make a particular decision))  (Money should not be the deciding factor over who runs a TV station.) 3 if an event, action etc decides something, it influences events so that one particular result will happen  (A goal in the last minute decided the match. | the deciding vote (=the person who has the deciding vote makes the final decision, because all the other votes are equally divided)) 4 decide in favour of/decide against a) to choose or not choose someone or something  (After long discussion they decided in favour of the younger candidate.) b) if a judge or jury (1) decides in favour of someone or against someone, they say in court that someone is guilty or not guilty  (The jury decided in favour of the plaintiff.) decide on sth phr v to choose one thing from many possible choices  (Have you decided on a date for your wedding?)