استثبت
1.
See تثبّت فِى الأَمْرِ.
2.
[Also He sought, or desired, or demanded, confirmation, evidence, proof, demonstration, verification, assurance, or positive or certain information,
عَنْهُ
respecting him, or it.
3.
And He desired, or meant, an affirmation: see a remark on a verse cited voce بَيْدَ.]
4.
استثبتهُ
He found it to be sound, valid, substantial, real, sure, certain, true, right, correct, just, or proper: (Har p. 175:) and he assured, or certified, himself of the true state of his case. (Idem, p. 426.) You say, صَغَّرَ عَيْنَهُ
لِيَسْتَثْبِتَ النَّظَرَ (assumed tropical:) [He contracted his eye in order to assure himself of the correctness of the view; i. e., to obtain a sure view]. (M in article وص.)
5.
It is also said to mean He made him, or asserted him to be, firm of heart: but Er-Rázee says, I have not met with this verb used as one that is immediately transitive. (Har p. 426.)