Used figuratively to describe actions that are excessive or unnecessary, not literally falling in water. He always goes overboard with his birthday plans, renting a limo and a five-star hotel suite.
Pro Tip 2/3
Negative Connotation
Often implies a lack of restraint or going past what is considered reasonable or appropriate. She went overboard on the spicy food, and now everyone's mouth is on fire.
Pro Tip 3/3
Emotional Overinvestment
Suggests becoming too emotionally involved in something, which could lead to disappointment. Try not to go overboard with excitement about the job interview; there are many applicants.