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concentrate at (some place)
1. To have people gather in a particular place or area. In this usage, a noun or pronoun is used between "concentrate" and "at." Concentrate all the guests at the entrance to the venue for now—I don't want them to see the wedding party just yet.
2. To gather in a particular place or area in large numbers. Most of the guests are concentrated at the buffet right now. I had a hard time getting down the hallway because so many students were concentrated at the door to the gym.
See also: concentrate
concentrate on (someone or something)
To focus on a particular person or thing. I'm sorry, but I can't concentrate on what you're saying with that music blaring in the background. If you want to get into the college of your choice, you really need to concentrate on your schoolwork.
concentrate the mind
To cause someone to focus on something, usually what is important in a particular situation. I didn't think I was capable of diffusing a bomb, but nothing concentrates the mind more than the threat of danger!
concentrate at some place
to gather thickly at a place. The moths concentrated at the window at night, attracted by the light. All the thirsty children concentrated at the water fountain.
concentrate someone or something at something
to cause people or things to gather at a place; to cause people or things to convene or converge at a place. You shouldn't concentrate all the guards at one entrance. The general concentrated all the big guns at the entrance to the valley.
See also: concentrate
concentrate something on someone or something
to focus something on someone or something; to center on someone or something. Let's try to concentrate our efforts on finishing this job today. She concentrated her attention on Lynn.
concentrate (up)on someone or something
to focus one's thinking on someone or something; to think intensely about someone or something. (Upon is formal and less commonly used than on.) Please concentrate upon Jeff. He is the one we should discuss. Try to concentrate on your work more.