Plimsoll line
noun [ C usually singular ] uk/ˈplɪm.sɒl ˌlaɪn/ us/ˈplɪm.sɑːl ˌlaɪn/ (also Plimsoll mark)
(船)载重线标志,干舷标志,吃水线
a line painted on the outside of a ship that shows how deep it is legally allowed to go down into the water when it is full