名詞 wag:

1. a witty amusing person who makes jokes
   同義詞：wit, card
2. causing to move repeatedly from side to side
   同義詞：waggle, shake

動詞 wag:

1. move from side to side
   同義詞：waggle

1. Dogs wag their tails when they are pleased.
   狗一高興就搖尾巴。
2. The dog's tail wagged.
   那只狗的尾巴搖擺著。
3. The dog wagged its tail.
   狗搖了搖尾巴。
4. The news set tongues wagging.
   那則消息使人們議論紛紛。

wag

v.（動詞）
wagged,wag.ging,wags
v.intr.（不及物動詞）
To move briskly and repeatedly from side to side, to and fro, or up and down.
搖擺：輕快并重復(fù)地從一邊到一邊、前后或上下運(yùn)動
To move rapidly in talking. Used of the tongue.
饒舌：說話時舌頭動得很快。用于舌頭
To walk with a clumsy sway; waddle.
搖擺著走：笨拙地?fù)u擺著走；蹣跚
Archaic To be on one`s way; depart.
【古語】 上路；離開
v.tr.（及物動詞）
To move (a body part) rapidly from side to side or up and down, as in playfulness, agreement, admonition, or chatter.
搖動（擺動）：快速地從一邊到一邊地或上下地運(yùn)動（身體的一部分），如表示頑皮、同意、警告或聊天
n.（名詞）
The act or motion of wagging:
搖擺：搖擺的動作或姿勢：
例句：
a farewell wag of the hand.
告別時揮手

來源：
Middle English waggen * see wegh-
中古英語 waggen *參見 wegh-

【引伸】
wag.ger
n.（名詞）

---------------另--------------
wag
wag 2

n.（名詞）
A humorous or droll person; a wit.
幽默者：幽默或滑稽的人；機(jī)智的人

來源：
Perhaps from wag
可能源自 wag