undersubscribe

[uhn-der-suh b-skrahyb]
verb (used with object), un·der·sub·scribed, un·der·sub·scribing.
  1. to subscribe for less of than is available, expected, or required: The concert series is undersubscribed and may be cancelled.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018