trail

【原文】
But their market share continues to trail the levels they enjoyed before tensions flared last year.

【単語の意味（英語）】
follow somebody or something by looking for signs that show you where they have been
walk slowly because you are tired or bored, especially behind somebody else

【単語の意味（日本語）】
（人）の後を走る；（人・動物）の跡をつける

【コメント】
【追う、追いかける】pursue, follow, chase
【遅れをとる】fall behind
【ついていく】follow, tag