used to refer to a type of betting (= risking money on horse races, sports games, etc.) that is done while the event is happening

In-play betting accounted for 43% of the amounts staked in that period. 在这段时间里，赛中押注占赌注总额的43%。

It is the only bookmaker to offer point-by-point betting on every Wimbledon match and the launch of an expanded in-play basketball product. 该公司是唯一一家在每场温布尔登网球赛事上都提供逐点投注的博彩公司，并推出了一款扩大型篮球赛中押注。

They’ve been doing in-running betting for years. 多年来他们一直在进行赛中投注。

while a horse race, sports game, etc. is happening

Betting in-play on the major golf tournaments has become popular in recent years. 近年来，各大高尔夫赛事的赛中投注已经变得非常流行。

They took a string of three-figure bets, including one of 500 euros at 5-1 in play. 他们多次投注，金额都在三位数，其中包括一个500欧元的投注，以5比1的赔率赛中投注。

The ideal moment to back him might be in-running. 支持他的最好时刻可能是在比赛进行中。