谷底

谷底	gǔ dǐ	valley floor / (fig.) lowest ebb / all-time low
谷	gǔ	grain / corn
谷	Gǔ	surname Gu
谷	gǔ	valley
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)