Making A Move?

The other day, I heard a sports report that made a comment that truly befuddled me.   I don't play golf, and the comment was about a round of the US Open that was going on this week-end.   My lack of experience in the game may be at least partly why the comment confused me.

The report said something to the effect of so-and-so was holding a one stroke lead as the round began and that the other leading players were now going to "make their moves."   The comment made no sense to me in the context of golf.   What were the other competitors going to do, stop playing badly?  

How does one "make a move" in golf?   I mean, it's not like car racing, where a driver can stomp on the gas and slip around another car.   Or even yacht racing, where a competitor can do some magical thing with the sails that allows the yacht to gain speed.   In other individual sports, you don't often hear of someone "making his move" to overtake a leader.   Tennis?

So how does one "make a move" in golf?  Stop landing in traps and water hazards?   It's not like anyone lands in those places on purpose in the first place...