這裏的due意思是expected to happen or arrive at a particular time
牛津高階英語詞典：
due
adjective, noun, adverb
adjective
caused by
[not before noun] ~ to sth/sb caused by sb/sth; because of sb/sth: The team's success was largely due to her efforts. ◆ Most of the problems were due to human error. ◆ The project had to be abandoned due to a lack of government funding. ◆ Due to staff shortages, we are unable to offer a full buffet service on this train.
Help Note: Some people think that it is more correct to use owing to to mean 'because of' after a verb or at the beginning of a clause, as due is an adjective.
expected
[not before noun] ~ (to do sth)
~ (for sth) arranged or expected: When's the baby due? ◆ Rose is due to start school in January. ◆ The band's first album is due for release later this month. ◆ The next train is due in five minutes. ◆ (especially AmE) My essay's due next Friday (= it has to be given to the teacher by then).
owed
[not usually before noun] when a sum of money is due, it must be paid immediately: Payment is due on 1 October.
[not before noun] ~ (to sb) owed to sb as a debt, because it is their right or because they have done sth to deserve it: Have they been paid the money that is due to them? ◆ Our thanks are due to the whole team.
[not before noun] ~ (for) sth owed sth; deserving sth: I'm still due 15 day's leave. ◆ She's due for promotion soon.
suitable / right
[only before noun] (formal) that is suitable or right in the circumstances: After due consideration, we have decided to appoint Mr. Davis to the job. ◆ to make due allowance for sth ◆ (BrE) He was charged with driving without due care and attention.
Compare: UNDUE
Idioms: in due course at the right time and not before: Your request will be dealt with in due course.
with (all) due respect used when you are going to disagree, usually quite strongly, with sb: With all due respect, the figures simply do not support you on this.
noun
(your / sb's ~) [U] a thing that should be given to sb by right: He received a large reward, which was no more than his due (= than what he deserved). ◆ She's a slow worker, but to give her her due (= to be fair to her), she does try very hard.
(dues) [pl.] charges, for example to be a member of a club: to pay your dues ◆ trade union dues
adverb
~ north / south / east / west exactly; in a straight line: to sail due east ◆ The village lies five miles due north of York.
劍橋高級學習詞典
due 1
due (OWED) /dju?/ US /du?/
adjective
owed as a debt or as a right:
The rent is due (= should be paid) at the end of the month.
Fifty pounds is MAINLY UK due to me/MAINLY US due me by the people I worked for last month.
Our thanks are due to everyone.
UK LEGAL He was found to have been driving without due (= the necessary) care and attention.
due /dju?/ US /du?/
noun
give sb their due said when you are praising someone for something good they have done, although you dislike other things about them:
He failed again, but to give him his due, he did try hard.
dues /dju?z/ US /du?z/
plural noun
the official payments that you make to an organization you belong to:
Members of the society pay $1000 in annual dues. due 2
due (EXPECTED) /dju?/ US /du?/
adjective
expected to happen, arrive, etc. at a particular time:
What time is the next bus due?
The next meeting is due to be held in three months' time.
Their first baby is due in January.