torni -ton-to'i- gismu

x1 twists under load/force/torsion x2.

See also tinsa, trati.

In notes:

tinsa
x1 is stiff/rigid/inflexible/resistant in direction x2 against force x3 under conditions x4.
trati
x1 is taut/tense/strained tight in direction x2.
selto'i
t2 (load/force/torque) twists/causes torsion in t1.
tolselto'i
t2 (load/force/torque) untwists t1.