すらなければならない【擦らなければならない】
suranakereba naranai
1. Must polish; Must rub
★ Common
Adjective
#702339
1. Must polish; Must rub
1. I see; that's right
1. even
1. mere; simple
1. slump
1. slice
2. slice
3. slice (in tennis, table tennis, etc.); backspin shot
1. to rub; to scrub
1. to rub; to pat