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Find a vessel large enough to contain the entire glass. Fill it so high that it is flows over the top. After filling it, place something under the vessel to collect all spilled water.
Carefully slip the glass into the vessel so that the glass fills as it is submersed. Water will pour into the lower container. Transfer this water into a measuring cylinder.
The water collected is what was displaced by the glass. It must have the same volume as the glass. Archimedes' principle actually goes a bit further that this, but this is how you measure the volume.
Also, you can probably come up with some variation of this process that does not make such a mess.
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