口头之交 kǒutóuzhījiāo casual friendship Origin Definitions Defs Strokes Stroke Words Sentences Sents 口头 口頭 kǒutóu in words only on the tip of one's tongue; only in words or on the surface rather than in action之 zhī particle [possessive] Connects a describing word or phrase to the noun it describes, similar to 的 de but used in formal or literary writing.交 jiāo noun friendship Friendship; social or diplomatic relations