It's a way of saying 'with'.

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3. Point out the subject of the sentence and state what it is expressed by. Example: He likes oranges. – He is a subject which is expressed by personal pronoun. 1. People are always rather bored with their parents. That’s human nature. 2. “I have nothing to declare except my genius.” (O. Wilde at the New York Customs House) 3. Which way has Nick gone? 4. To do nothing is the way to be nothing. 5. Something is rotten in the state of Denmark. 6. The young in spirit enjoy life. 7. To be seventy years young is sometimes far more hopeful than to be forty years old. 8. Well begun is half done. 9. One should eat to live, not live to eat. 10. Two is company, but three is none. 11. What is the matter with him? 12. Here lies my wife: here let her lie. Now she’s at rest, and so am I. (epitaph intended for J. Dryden’s life). 13. The grocer’s was closed. 14. For us to e left by ourselves was a rare happening. 15. ‘Be’ is a verb.