We prove that any set-theoretic solution of the Yang–Baxter equation associated with a dual weak brace is a strong semilattice of non-degenerate bijective solutions. This fact makes use of the description of any dual weak brace S we provide in terms of strong semilattice Y of skew braces $$B_\alpha $$
B
α
, with $$\alpha \in Y$$
α
∈
Y
. Additionally, we describe the ideals of S and study its nilpotency by correlating it to that of each skew brace $$B_\alpha $$
B
α
.