godan verb (-su)
transfer a stowaway
Used when a stowaway is moved from one vehicle or vessel to another, typically in a smuggling or illegal transport context. Rare and specialized term.
密航者を別の船に乗り移す手口が摘発された。
The method of transferring stowaways to another ship was uncovered.
Compound of 乗り (continuative form of 乗る 'to board') + 移す 'to transfer'. The exact historical derivation is uncertain, but the meaning follows transparently from the components.