1. roofbolt - Noun
2. roofbolt - Verb
roofbolt (plural roofbolts)
(mining) A safety bolt installed in the roof of an underground mine.
roofbolt (third-person singular simple present roofbolts, present participle roofbolting, simple past and past participle roofbolted)
(mining) To install safety bolts in the roof of an underground mine.