A bull in a china shop
Definition 1 of 1
Pro Tip 1/3Metaphorical use
This idiom is used metaphorically to describe a person's behavior, not their physical presence. 
When managing the budget, don't be a bull in a china shop; be careful.
Pro Tip 2/3Negative connotation
The phrase usually implies criticism and is used to suggest someone is unfit for a delicate situation. 
His negotiations were like a bull in a china shop — aggressive and destructive.
Pro Tip 3/3Use with caution
Be mindful when using this idiom as it could offend someone if directed at them. 
Calling your colleague a bull in a china shop might hurt their feelings.