The Austronesian Comparative Dictionary

*undur retreat, fall back

PWMP undur retreat, fall back

WMP
Kadazan Dusun undul go backwards, retreat, retire, recoil, recede
Simalungun Batak undur ebb, retreat
Malay undur retirement, retreat, falling back
Makassarese unduruʔ slacken, decrease, as anger; not remaining by, given up
Old Javanese undur retiring, retreating
Javanese undur backward motion, withdrawal
Balinese undur retreat, yield