librarsi significa in inglese

glide [glided, gliding, glides]▼(To fly unpowered, as of an aircraft)
verb
[UK: ɡlaɪd] [US: ˈɡlaɪd]

hover [hovered, hovering, hovers]▼(to float in the air)
verb
[UK: ˈhɒ.və(r)] [US: ˈhə.vər]