This is the 2266th most frequent Japanese word.
込み
"込み" (komi) means "included" or "inclusive."
Here, '込み' is used as a noun meaning 'included,' referring to taxes being part of the price.
その価格には税金が込みです。
The price includes taxes.
In this sentence, '込み' is attached to '人' (people) to form '人込み,' which means 'crowd.'
彼は人混みに紛れて見失った。
He got lost in the crowd.
Here, '込み' is part of the compound verb '走り込む,' indicating depth or thoroughness of an action.