失败者的意思是指在某种竞争或挑战中落败的人，无法达到预期目标或获得成功的人。这个词可以用来形容任何领域中的失败，包括工作、学业、比赛、关系等等。

英文释义：A loser refers to someone who has been defeated in a competition or challenge, or someone who is unable to achieve their desired goals or succeed. This word can be used to describe failures in any field, including work, academic, sports, relationships, etc.

怎么读（音标）：[ˈluːzər]

用法：作为名词使用，可用于形容人或事物。通常带有贬义，常用于口语中。

例句1-5句且中英对照：

1. He was always a loser in school, never getting good grades or making any friends. (他在学校总是一个失败者，从来没有取得过好成绩或交到朋友。)

2. The company's latest product was a complete failure, making them the biggest losers in the market. (公司最新推出的产品完全失败了，使他们成为市场上最大的失败者。)

3. She felt like a loser after being rejected by her dream university. (被她梦想的大学拒绝后，她觉得自己像个失败者。)

4. Don't be such a sore loser! You can't win every time. (别那么输不起！你不可能每次都赢。)

5. He may have lost the game, but he's not a loser in life. (他也许输掉了比赛，但在生活中他并不是个失败者。)

同义词及用法：failure、defeat、unsuccessful、non-winner、underachiever等都可以用来替换loser，表示失败的人或事物。

编辑总结：失败者一词通常带有贬义，可用于形容人或事物，在口语中使用较多。它可以指任何领域中的失败，包括工作、学业、比赛等等。同义词包括failure、defeat等。