a primitive root; to split or open, i.e. (literally, but only as denominative from H8179); compare see H7778; to act as gatekeeper; (figuratively) to estimate; think.
Usages throughout the bible
Proverbs 23:7
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For as he thinketh H8176 in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee.