To fight tooth and nail

To fight tooth and nail - to use a lot of effort to oppose someone or achieve something.

Example - "I'm going to fight tooth and nail for that promotion"

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To surmise

To surmise - to suppose something is true without having evidence to confirm it.

Example - "He surmised that something must be wrong"

Image - http://wordinfo.info/words/images/surmise-2.jpg

To burn bridges

To burn bridges - to make decisions that cannot be changed in the future; to permanently and unpleasantly end your relationship with a person or organisation.

Example - "If you drop out of school now, you'll be burning your bridges behind you"

Image - https://media.licdn.com/mpr/mpr/p/6/005/089/2a0/0daedcf.jpg

The scum of the earth

The scum of the earth - the worst type of people.

Example - "People who abuse children are the scum of the earth"

Image - http://www.azquotes.com/picture-quotes/quote-the-rich-are-the-scum-of-the-earth-in-every-country-gilbert-k-chesterton-71-10-71.jpg