Core sense — it (water) stagnated in a hollow; he steeped a medicine in watergenerated
1.1it (water) remained, or stagnated, or collected, in a hollow—اِسْتَنْقَعَ
Or it remained long and became altered. Or the former [and latter] collected in a مَنْقَع, or the latter [and former] became yellow and altered.
1.1.1[he macerated, steeped, or soaked, a medicine in water,] he left it in water until its colour changed—نَقَعَ
same meaning—أَنْقَعَ
Show Lane's original text
and اِسْتَنْقَعَ It (water) remained, or stagnated, or collected, in a hollow, or cavity: (Mgh:) or remained long, and became altered: (Msb:) or the former [and latter] collected in a مَنْقَع : (S:) or the latter [and former] became yellow and altered. (K.) نَقَعَ and أَنْقَعَ [He macerated, steeped, or soaked, a medicine, in water,] he left it in water until its colour became changed. (Msb.)