From an unused root meaning to open (the eyes); a {wink} that {is} moment (compare {H6597}) (used only (with or without preposition) adverbially quickly or unexpectedly): - at an instant {suddenly} X very.
A primitive root; to open {up} that {is} (figuratively) interpret (a dream): - interpret ({-ation} -er).
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Num 6:9And if any man die veryH6621 suddenly by him, and he hath defiled the head of his consecration; then he shall shave his head in the day of his cleansing, on the seventh day shall he shave it.
Isa 29:5Moreover the multitude of thy strangers shall be like small dust, and the multitude of the terrible ones shall be as chaff that passeth away: yea, it shall be at an instantH6621 suddenly.
Isa 30:13Therefore this iniquity shall be to you as a breach ready to fall, swelling out in a high wall, whose breaking cometh suddenly at an instantH6621.