at will

at will idiom
Freely, as one pleases, as in The grounds are open to the public and one can wander about at will, or With this thermostat you can adjust the room temperature at will. [1300s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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