自圓其說

to make a story or theory consistent / to give a plausible explanation / to plug the holes in one's story

self / oneself / from / since / naturally / surely

his / her / its / their / that / such / it (refers to sth preceding it)

circle / round / circular / spherical / (of the moon) full / unit of Chinese currency (yuan) / tactful / to make consistent and whole (the narrative of a dream or a lie)

to persuade

to speak / to say / to explain / to scold / to tell off / a theory (typically the last character in a compound, as in 日心說|日心说 heliocentric theory)

to speak; to talk; to say / to explain; to comment / to scold; to tell off / (bound form) theory; doctrine