dismiss/dɪsˈmɪs/ v 解雇；去除；不予考虑（驳回）

记忆：dis=no否定，miss=mit-送，transmit v 传输。不送了，不用你了！

I think we can safely dismiss their objections.不予考虑

Dismissing her fears, she climbed higher.排除去除恐惧

She claims she was unfairly dismissed from her post.解雇

The case was dismissed.驳回

dismiss

reject/rɪˈdʒekt , ˈriːdʒekt/ v 拒绝 n 次品

记忆：re-return，ject-投，投过来再投回去，你给我gift我再还回去。产品不合格就要回炉！

to reject an argument/a claim/a decision/an offer/a suggestion

Please reject the following candidates（candidate 候选人；can能did=do能胜任的人）

Imperfect articles are rejected by our quality control.(imperfect 不完美的，有瑕疵的，im=no，perfect 完美的。quality a 高质量的，这里应该是：严格的意思)

reject your idea

refuse/rɪˈfjuːz , ˈrefjuːs/ v 拒绝 n 废弃物 a 无价值的

记忆：re=return，fuse=flu流，拒绝往一块流

He flatly refused to discuss the matter.（flatly adv 果断地，flat 平的，就是直接的！）

I politely refused their invitation.（politely，polite 有礼貌的；invitation，invite 邀请，vit=see，in-进来看！和visit有异曲同工之妙）

They refused him a visa.（visa 签证 v 签发签证）

拒绝refuse吸烟

turn down ：拒绝，关小，调低

I relish the challenge of doing jobs that others turn down（relish v 喜欢，享受 n 享受，乐趣）

There's no reason whatsoever to turn down this suggestion.（whatsoever[ˌwɒtsəʊ'evə(r)] adv 丝毫，任何 adj 不管怎样，任何 pron 任何事物）

He didn't have the heart to turn down their request.不忍心拒绝他们的请求

decline/dɪˈklaɪn/ v 谢绝，婉言拒绝 ；下降；衰弱 n下降，衰弱

记忆：de-下，当你决绝别人的时候，总喜欢用手往下推，表达不要的意思。

I offered to give them a lift but they declined.（lift，来自词根lev-举，提升，作名词有：搭便车的意思）

to decline an offer/invitation

Their spokesman declined to comment on the allegations.（allegation/ˌæləˈɡeɪʃn/ 指控 ）

decline更常表达的意思是“下降”

比较：除了dismiss把“拒绝”延伸为了：解雇，不予考虑；reject，refuse，turn down作为决绝讲，我感觉可以完全的互换；而decline是婉拒，就是委婉的拒绝，而不是直接说"我不要”。