a signal that danger, such as an air raid, is over; usually a siren at a single pitch / permission to proceed after obstacles have been removed

Very important; vital or crucial.

(chiefly Britain, slang) Nothing (variant of fuck all).

Not affected by climatic conditions; capable of normal operation regardless of precipitation, wind, sun, etc. / (figuratively) Always there when needed, reliable, dependable, loyal, faithful.

Able to do many or all things well. / Comprehensive in extent.

Generally, broadly.

(sports) a gymnastic event featuring several individual exercises

Being or relating to a situation that will either succeed completely or fail completely.

A style of wrestling with few rules or restrictions

(colloquial) Synonym of panacea: a medicine or practice that cures all human ailments.