They sang themselves hoarse.是什么意思？

They sang themselves hoarse.

他们嗓子都唱哑了。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

sang

v. 唱，歌唱( sing的过去式 )，（鸟）鸣，嗡嗡叫，呜呜作响；

例句
He sang and Alice accompanied him on the piano...
他一边唱，艾丽斯一边为他钢琴伴奏。

themselves

pron. 他[她，它]们自己，他们亲自，“himself”的复数，“herself”的复数；

例句
Most officers and men acquitted themselves well throughout the action.
大多数军官及士兵在整个战斗中表现出色。

hoarse

adj. 嘶哑的；

例句
When he spoke, his voice was hoarse and cracked.
他说话时声音沙哑颤抖。