concentrate at

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
Farlex Dictionary of Idioms.

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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • concentrate
  • concentrate at (some place)
  • concentrate at some place
  • orient
  • orient to
  • orient to (something)
  • not do (someone or oneself) any favors
  • spiff up
  • spiffed up
  • identify with
References in periodicals archive
Nine-month testing of pipe made with the new concentrate at pressures exceeding 1250 psi at 73 F for water pipe and 140 F for gas reportedly show that the 45% concentrate performs as well as the standard 35% formulation on the market.
Chemicals & Additives
Two-mil-thick LDPE film samples containing this concentrate at letdown ratios up to 12:1 reportedly have met the requirements of MVSS 302.
Flame retardants: product lines reviewed