[bark] at the moon
1
to take part in a protest that has no chance of reaching success
The idiom "bark at the moon" is originated from the behavior of dogs who bark at the moon, which is a futile and pointless activity since the moon is an inanimate object that cannot be affected by barking. The idiom is often used in a figurative sense, to describe someone who is pursuing a goal or engaging in an activity that is unlikely to succeed or to express a sense of frustration or disbelief at someone's behavior.
- The team's efforts to win the championship were like barking at the moon, as they were vastly outmatched by their opponents.
- Trying to convince her to change her mind is like barking at the moon - it's a waste of time and effort.