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undulate
🇬🇧EN
flap
Flap your wings or die.
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roll
Roll up your sleeves and get busy.
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flow
There is a constant flow of traffic on this road.
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wave
A cold wave passed over Japan.
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surge
It is expected that the tsunami surge will be ten meters or less.
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oscillate
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ripple
🇬🇧EN
popple