A snap

An easy task.The exam was a snap and I am sure that I did very well.

Snake in the grass

An enemy who pretends to be a friend."You should be careful of that woman. Although she seems very nice she is like a snake in the grass."

Snail`s pace

A very slow movement forward.The cars on the highway were moving at a snail`s pace.

Smear campaign (against someone)

A campaign (of rumors) aimed at damaging someone's reputation.There was a smear campaign against the mayor of the city.

So much the better

All to the better."So much the better, if extra people help us then we can get the work done quickly."

So much for (someone or something)

That is the last that you will see of someone or something.So much for going on a holiday this summer. I do not have any money.

So much

A large quantity of something.There was so much rain in the spring that our garden did not grow well.

So mad that one could scream

Very mad.I was so mad that I could scream when the travel agent made a mistake with my airline ticket.

So long

Goodbye."So long, I will see you next week."

So help me

I promise, I swear."So help me, if you do not pay me back my money I will phone your company."