She was beginning to lose ground (to the leaders) in the race.在赛跑中她开始失去领先地位。

The political party lost ground [=became less popular or successful; did not do well] in the election.该政党在选举中失利。

The company is losing ground to [=falling behind; not doing as well as] its competitors.这家公司不敌其竞争对手。