overdraft

noun
the amount of money that you owe to a bank when you have spent more money than is in your bank account;
an arrangement that allows you to do this:
to run up / pay off an overdraft
◆ I had to arrange an overdraft to pay for the car.
◆ The savings account has no overdraft facility.

incur

verb (-rr-) [VN] (formal)
if you incur sth unpleasant, you are in a situation in which you have to deal with it:
She had incurred the wrath of her father by marrying without his consent
if you incur costs, you have to pay them:
You risk incurring bank charges if you exceed your overdraft limit.

commit

[kəˈmit]

v.

1. perform an act, usually with a negative connotation

2. give entirely to a specific person, activity, or cause

3. cause to be admitted; of persons to an institution

4. confer a trust upon

5. make an investment

discretionary

adjective
[usually before noun] (formal) decided according to the judgement of a person in authority about what is necessary in each particular situation; not decided by rules:
You may be eligible for a discretionary grant for your university course.

allocation

noun
[C] an amount of money, space, etc. that is given to sb for a particular purpose:
We have spent our entire allocation for the year.
[U] the act of giving sth to sb for a particular purpose:
the allocation of food to those who need it most

assignment

noun
[C] a task or piece of work that sb is given to do, usually as part of their job or studies:
You will need to complete three written assignments per semester.
◆ She is in Greece on an assignment for one of the Sunday newspapers.
◆ one of our reporters on assignment in China
◆ I had set myself a tough assignment.
◆ a business / special assignment
[U] the act of giving sth to sb; the act of giving sb a particular task:
his assignment to other duties in the same company

inherent

/ ɪnˈhɪərənt, -ˈher-; ɪnˋhɪrənt, -ˋhɛr-/ adj

~ (in sb/sth) existing as a natural or permanent feature or quality of sb/sth
内在的; 固有的; 本来的:
an inherent distrust of foreigners 天生对外国人的不信任
* an inherent weakness in a design 设计本身存在的弱点
* the power inherent in the office of President 总统任内固有的权力.
> inherently adv: a design which is inherently weak 有内在缺陷的设计.