"Without let or hindrance" is the other meaning.
"Suffer" is another - "suffer the little children to come unto me" = allow.
All kinds of odd things like that, that we are used to because we have heard them since childhood.
I get the “suffer” duality — you allow something even if it pains or inconveniences you. But I don’t get that “let” means “don’t let”. Thanks for ‘splainin’, tho.
It must be like “sanction” — which can mean approve or disapprove.