safetyboat
nounUK /ˈseɪfti bəʊt/
US /ˈseɪfti boʊt/
A safetyboat is a small boat that stays nearby to help people if they get into trouble on the water.
The safetyboat followed the young sailors around the lake.
OTHER MEANINGS
2. A boat kept ready at a sailing event to assist capsized or distressed craft.
Every race had a safetyboat on standby near the turning mark.
3. A small powered craft used by a coach to watch and protect trainees.
The instructor circled the class in the safetyboat.
4. A vessel stationed near a swimming or diving area to warn and rescue.
A safetyboat patrolled the edge of the diving zone all afternoon.