HSK 7-9
积
jī动
to amass; to accumulate; to store up; (math.) product (the result of multiplication); (TCM) constipation; indigestion
雨水在屋顶低处积成水洼。
Yǔ shuǐ zài wū dǐng dī chù jī chéng shuǐ wā.
Rainwater accumulated in a puddle at a low point on the roof.
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Appears across levels (7-9) in the HSK 3.0 word list.