to be unwilling to do something or to allow something to happen

I balked at the prospect of spending four hours on a train with him. 想到要与他一起在火车上度过4个小时，我心里就犯嘀咕。

in baseball, to stop in the act of throwing the ball to the batter, in a way that is against the rules

a rough, thick piece of wood

in baseball, an act of stopping in the middle of throwing the ball to the batter, which is against the rules