noun
A boat carried on a ship for use in an emergency, or a boat used for rescuing people at sea.
船が沈みそうになったので、乗客はライフボートに乗り移った。
The ship was about to sink, so the passengers transferred to the lifeboats.
救命ボート is a more Japanese term for 'lifeboat', while ライフボート is a direct loanword from English and feels slightly more modern or technical.
Borrowed from English 'lifeboat'.