to cut; to cut through; to sever (connections, ties); to turn off (e.g. the light); to terminate (e.g. a conversation); to hang up (the phone); to punch (a ticket)
Examples (2 in total)
彼女は、自分は正しいといいきった。
She declared that she was right.
なんでトムが俺らとバスケしたくないっていいきれるんだよ？
What makes you so sure Tom doesn't want to play basketball with us?