be set in concrete

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be set in concrete

To be definitely and permanently decided or planned. We might get brunch next weekend, but nothing is set in concrete yet.
See also: concrete, set

be set in concrete

if an arrangement, a plan or a rule is set in concrete, it is completely fixed so that it cannot be changed (usually negative) We've drawn up some rough guidelines - they're by no means set in concrete.
See also: concrete, set