verb
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to wait for a right opportunity or favourable time.
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to keep oneself hiding and be prepared to pounce upon (a prey).
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to watch or observe closely and secretly; to spy.
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to keep oneself from being seen by others.
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to scheme, plan something secretely; to plan in a deceitful way.
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to come out from within; to emit (oneself).
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to accumulate, arrange for accumulation.
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to make suitable change in to suit a purpose.