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.
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).
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.
Take a length of piping with a bore of about 15mm.4 [singular] a wave of water that moves quickly along a river from the sea at particular times of the year :
the Severn bore
the Severn bore5TECTI [countable] a borehole

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