Privet.

I see при everywhere but I don't have a clue of what it means.
I have read the dictionary more than 20 times from the time I started learning Russian and yet I don't have the slightest clue of what it means.
I never use it.
I don't need just examples to understand it. I need to understand what are the corresponding words in English that are close to its meaning.

Please some help

P.S. I mean the preposition "при"
e.g. Коняга лежит при дороге и тяжко дремлет.