You alert the principal, Mr. Lay, to the shenanigans going on in the schoolyard.
From the businessweek.com
It's the Yum Bun Vietnamese pork belly food stall at Broadway Market schoolyard.
From the telegraph.co.uk
It's schoolyard bullying gone high-tech, often with no adults around to monitor.
From the dailyherald.com
The political playground sounds a lot like a kindergarten schoolyard these days.
From the news.enquirer.com
The equivalent of the schoolyard bully intimidating your lunch money out of you.
From the infowars.com
Amuse everyone with the classic schoolyard game with the dog playing the monkey.
From the sacbee.com
This in particular is shown in a scene in the Springfield Elementary schoolyard.
From the en.wikipedia.org
Cliques are found in the workplace, schoolyard, neighborhood and church groups.
From the dailyherald.com
It is also a desire familiar to anyone who ever experienced schoolyard slights.
From the newsobserver.com
More examples
The yard associated with a school
A school is an institution designed to provide learning spaces and learning environments for the teaching of students (or "pupils") under the direction of teachers. Most countries have systems of formal education, which is commonly compulsory. In these systems, students progress through a series of schools...