

inverts
/ɪnˈvɜːrts/ /ˈɪnvɜːrts/


noun
The base of a tunnel on which the road or railway may be laid and used when construction is through unstable ground. It may be flat or form a continuous curve with the tunnel arch.



noun
A skateboarding trick where the skater grabs the board and plants a hand on the coping so as to balance upside-down on the lip of a ramp.








