kupem
{кокымшо спряжениян глагол} [Generate paradigm] 1. to grow moldy (A.E.), to grow mouldy (B.E.)
♢ ložaš kupen {ойлончо} the flour grew moldy
2. to be covered by algae, to be covered with pond scum
♢ šinč́ə̑še jer kupen {ойлончо} the stagnant lake became covered with algae