柯林斯英语学习词典：commitcrime

commit是四级必会单词，我们对其了解通常在commit suicide和commit a crime中，殊不知，commit的用法非常广泛，以下是从OALD（《牛津高阶英语学习词典》）等综合摘录的用法。

commit

crime

1[transitive]~ a crime, etc.to do sth wrong or illegal

tocommit murder/adultery(注：n.通奸)

Most crimes are committed by young men.

Appalling（注：adj.可怕的） crimes committed against innocent children

suicide

2[transitive]~ suicideto kill yourself deliberately

promise/say definitely

3[transitive,?often passive] to promise sincerely that you will definitely do sth, keep to an agreement or arrangement, etc

~ sb/yourself (to sth/to doing sth)The President is committed to reforming health care.

Borrowers should think carefully before committing themselves to taking out a loan.

~ sb/yourself to do sthBoth sides committed themselves to settle the dispute peacefully.

注：个人认为，commit sb/yourself to do sth用法较少，因为《柯林斯英语学习词典》和《韦氏高级英语学习词典》完全没有提及此用法，还是不用为佳。这样更好：

Both sides committed themselves to settling the dispute peacefully.

4[transitive]~ yourself (to sth)to give an opinion or make a decision openly so that it is then difficult to change it

You don't have to commit yourself now, just think about it.

be loyal

5[intransitive]~ (to sb/sth)to be completely loyal to one person, organization, etc. or give all your time and effort to your work, an activity, etc

Why are so many men scared to commit? (= say they will be loyal to one person)

money/time

6[transitive]~ sthto spend money or time on sth/sb

The council has committed large amounts of money to housing projects.

to hospital/prison

7[transitive,?often passive]~ sb to sthto order sb to be sent to a hospital, prison, etc

She was committed to a psychiatric hospital.

sb for trial

8[transitive]~ sbto send sb for trial in court

sth to memory

9[transitive]~ sth to memoryto learn sth well enough to remember it exactly

She committed the instructions to memory.

sth to paper/writing

10[transitive]~ sth to paper/writingto write sth down

一共这个10个用法，其实都挺常用的。commit的派生词也很多，除了我们熟知的commitment以外，还有：

committed，adj.,尽心尽力的，坚定的，从以上意义5派生而来，反义词是uncommitted.

Committal, n,收监，拘押；送入精神病院。从以上意思7派生而来。

non-committal，adj.,态度不明朗的，不承担责任的，含糊的，从意义4派生而来。

如：The doctor was non-committal about when I could drive again.

a non-committal reply/tone.

注意non-committal并不是committal的反义词。表示“含糊的”，我们原来有2个单词：vague和ambiguous，现在又多了一个non-committal，挺好的。

committee，也是我们比较熟的，n,委员会，应该是从以上意义3或4派生而来（即:负有责任的、表态做决定的人）。

另：commitment，也复习一下，

承诺，义务；献身，努力

主要有：make a commitment to do something.承诺

We made a commitment to keep working together.我们作了承诺要继续在一起工作。

government's commitment to public service.义务

The company's commitment to providing quality at a reasonable price is a key to succeed.义务

commitments to the family.义务

family commitments义务

A career as an actor requires one hundred percent commitment.努力。

最后，比较一下：

如果说“承诺做某事”之意，可以用make a commitment to do sth.或者commit oneself to (doing)sth.或be committed to (doing)sth.这里有人经常搞错。