Noun | 1. | skid lid - a crash helmet crash helmet - a padded helmet worn by people riding bicycles or motorcycles; protects the head in case of accidents Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom |