3 noun
1 [singular] something that is not interesting to you or that annoys you:
Waiting is a bore.
You'll find it's a terrible bore.
2 [countable] someone who is boring, especially because they talk too much about themselves or about things that do not interest you:
He turned out to be a crashing bore (=used to emphasize that someone is very boring).
3PMW [singular] the measurement of the width of the inside of a long hollow object such as a pipe or the barrel of a gun:
Take a length of piping with a bore of about 15mm.
wide/narrow/fine bore
a fine bore tube
4 [singular] a wave of water that moves quickly along a river from the sea at particular times of the year:
the Severn bore
5TECTI [countable] a borehole

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