■ noun
1》 anxious or frightened awareness of danger.
↘a warning of danger.
2》 a warning sound or device.
■ verb
1》 frighten or disturb.
2》 ( be ~ed ) be fitted or protected with an ~.
Derivatives
~ing adjective
~ingly adverb
Origin
ME (as exclamation meaning 'to arms!'): from OFr. ~e , from Ital. allarme , from all' arme!