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Question

pay a heavy price

CNN :

Prime Minister Binali Yildirim has vowed that "they will pay a heavy price."

Answer 1

(+)

Also:

pay a high price (for something)

http://goo.gl/1CEvoJ

Answer 2

Thank you.+1

Also : ......... will cost them very much. / They have to bear enormouse cost(s) for it.

Answer 3

Also" pay dearly