quaver

名词 quaver:

1. a tremulous sound
2. a musical note having the time value of an eighth of a whole note
   同义词：eighth note

动词 quaver:

1. give off unsteady sounds, alternating in amplitude or frequency
   同义词：waver
2. sing or play with trills, alternating with the half note above or below
   同义词：warble, trill

1. She quavered an old folk song.
   她以震颤声唱一首古老的民谣。
2. You could hear the quaver in her voice.
   她的声音中能听出有些颤抖。
3. The children quavered out their little song.
   孩子们颤悠悠地唱出了一支歌。

qua.ver

v.（动词）
qua.vered,qua.ver.ing,qua.vers
v.intr.（不及物动词）
To quiver, as from weakness; tremble.
颤抖：战栗，如因虚弱；颤抖
To speak in a quivering voice; utter a quivering sound.
以颤音说话：以颤抖的声音说；发出颤抖的声音
Music To produce a trill on an instrument or with the voice.
【音乐】 发颤声：在乐器上奏出颤音或以颤音演唱
v.tr.（及物动词）
To utter or sing in a trilling voice.
以颤抖的声音说或唱
n.（名词）
A quivering sound.
颤抖的声音
A trill.
颤音
Chiefly British An eighth note.
【多用于英国】 八分音符

来源：
Middle English quaveren [probably frequentative of] cwavien, quaven [to tremble]
中古英语 quaveren [] 可能是cwavien, quaven的重复动词 [颤抖]

【引伸】
qua.veringly
adv.（副词）
qua.very
adj.（形容词）