圆脸 literally means 'round face' (a noun phrase), but the POS field marks it as verb-object (v.o.). The verb sense 'to save sb.'s face' shown in the gloss is normally written as 圆场 (yuán chǎng), not 圆脸. This row likely contains a data error that merges two distinct entries. If you treat it as a v.o. word, it would follow the pattern of separable verbs — but actual usage of 圆脸 as a verb-object is extremely rare. Use with caution; the noun sense 'round face' is the common understanding.