/ˈdʒækˌlɛɡz/
NOUN
People who lack the necessary skills, training, experience, or qualifications to perform a particular job or professional task competently.
Used to describe people who are inexperienced, untrained, or unfamiliar with a particular activity, occupation, or field of work.
Used particularly for people who attempt professional or skilled work without possessing the competence, technical knowledge, or qualifications required to perform it properly.
Used informally or dismissively to refer to inexperienced individuals, newcomers, or young people who lack the knowledge and abilities of seasoned practitioners.
NOUN
Pneumatic rock drills operated using compressed air, commonly supported by an adjustable air-powered leg for drilling in mining and excavation operations.
Used in mining and underground excavation to refer to pneumatic drilling machines equipped with supporting legs that position and advance the drill against rock surfaces.