1. To study or know (a role) so as to be able to replace the regular performer when required.
  2. To act as an understudy to.
Source: “Understudy.” The American Heritage┬« Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. Answers.com 10 Mar. 2010. http://www.answers.com/topic/understudy

Omnibus Rules

Understudy means any qualified Filipino citizen designated by a local employer to be trained by a foreign national allowed to work in the country by virtue of an employment permit granted to him by the Secretary of Labor and Employment under an approved understudy training program.

Caveat: Subsequent court and administrative rulings, or changes to, or repeal of, laws, rules and regulations may have rendered the whole or part of this article inaccurate or obsolete.