進
シン, すす.む, すす.める, のぶ
advance, proceed, progress, promote
JLPT3 G3 S11 F142
隹 here an abbreviated form# of 隼 (swift bird) + 辵 movement → birds advancing in swift flight and tight formation (compare 迅) → *advance* → *offer*; *promotion*.
[Full Kanji Etymology List]