Noun
1. the sport or activity swimming underwater
Test
1 / 5
He's very learned but rather absent-minded.
2 / 5
He was not about to admit his mistake.
3 / 5
He must be 50 and above.
4 / 5
a frame with rows of sliding beads, used for doing arithmetic
5 / 5
The abbey is now a ruin.
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