And loose the knot of my tongue.
"And untie a knot from my tongue.
Unloose the knot upon my tongue
And loose the knot from my tongue
And untie/undo (the) difficulty/knot from my tongue/speech
“Please give my power of speech (which has been impeded as he put fire in his mouth when he was a child)…
"And untie the knot of my tongue."
`And loose the knot from my tongue
"Remove the knot in my tongue."
And untie the knot from my tongue
`And remove the impediments from my tongue
"And make loose the knot (the defect) from my tongue, (i.e. remove the incorrectness from my speech) (That occurred as a result of a brand of fire which Moosa (Moses) put in his mouth when he was an infant). (Tafsir At-Tabaree, Vol. 16, Page 159)