A shout or whistle expressing dislike, especially from a crowd or audience; a jeer, a boo.
A whistle blown by a theatre-goer to express disapproval.
A shout, whistle, or comment of a sexual nature, usually made toward a passing woman.
In the Eiffel programming language, a run-time error caused by use of the wrong data type.
To make such an exclamation.
The act or quality of endorsing
Sponsorship, in means of money, by a company, business or enterprise.
An amendment or annotation to an insurance contract or other official document (such as a driving licence).
An instructor's signed acknowledgement of time practising specific flying skills.
Permission to carry out a specific skill or application in a field in which the practitioner already has a general licence.
Support from an important, renowned figure of a media (celebrity, politics, sports, etc.), to get back up.