1. The problem states that triangles $\triangle BCD$ and $\triangle WVU$ are congruent, and we need to find the segment congruent to $DB$. 2. When two triangles are congruent, their corresponding sides and angles are congruent. The order of letters in the congruence statement shows the correspondence: $B \leftrightarrow W$, $C \leftrightarrow V$, and $D \leftrightarrow U$. 3. Since $DB$ is a side in $\triangle BCD$, we look for the corresponding side in $\triangle WVU$ by matching the vertices in the same order. 4. The side $DB$ connects vertices $D$ and $B$. Using the correspondence, $D$ corresponds to $U$ and $B$ corresponds to $W$. 5. Therefore, the side congruent to $DB$ is $WU$. 6. Final answer: $DB \cong WU$.