noun, British English - the time after which television programmes with adult content may be broadcast (9 p.m. in Britain)
noun - the time when the sea is at its lowest level and the water has moved far back from the shore
noun - the time when the sea reaches its highest level and comes furthest up the shore
noun - a continuous, soft, low, and fast spinning sound
verb - to make a continuous, soft, low, and fast spinning sound, or to move while making such a sound