Bistable N–H⋯N hydrogen bonds between rotors and stators enable delicate modulation of dynamic molecular motion by slowing down the fast rotation in a N–H⋯N hydrogen-bonded organic co-crystal of 1,2-diazabicyclo(2.2.2)octane bis(thiourea), which has been elucidated by the combination of variable-temperature (VT) X-ray structure analyses and VT solid-state nuclear magnetic resonance techniques.