breaking through a checkpoint; sneaking past a barrier
Historical term referring to the act of illegally passing through a checkpoint (関所) during the Edo period, often by stealth or force.
During the Edo period, breaking through a checkpoint was a serious crime.
旅人は関所破りを企てたが、見張りに見つかった。
The traveler attempted to sneak past the barrier, but was spotted by the guards.