に遅れず

without being late for

→ に
phrase Very common #1,596
without being late for The examples use に遅れた or に遅れて, meaning “be late for.” The exact term に遅れず is the negative form of 遅れる and is commonly followed by に to mean “without being late for.”
JA: 授業に遅れずに着きました。
EN: I arrived without being late for class.