交底

交底	jiāo dǐ	to fill sb in (on the details of sth) / to put all one's cards on the table
交	jiāo	to hand over; to deliver; to pay (money); to turn over / to make friends / (of lines) to intersect / variant of 跤
底	de	(equivalent to 的 as possessive particle)
底	dǐ	bottom; base / background; foundation / copy (of a manuscript or receipt etc) kept as a record / (suffix) end of a year or month / (math.) radix; base (abbr. for 底数)