Which of the following is the most accurate definition of 'Wag'?

• The required answer is - To shake or move in a back-and-forth motion.

• Wag (verb-transitive), (verb intransitive)
English Meaning:
1. Wag (something) if a dog wags its tail, or its tail wags, its tail moves from side to side several times.
2. To shake your finger or your head from side to side or up and down, often because you do not approve of something.
Bangla Meaning: (wagged, wagging, wags) (লেজ ইত্যাদি) নড়া; নাড়া: a wagging tail.

Example Sentence:
1. Just remember what I said,’ she repeated, wagging her finger at him.
2. The happy dog wagged his tail.

Source: Website Lecture.