overeagerness; rashness; jumping the gun
Describes acting too hastily out of enthusiasm, often leading to a mistake or failure. Common in everyday language.
His overeagerness caused the project to fail.
We rushed into the contract out of overeagerness and later found problems.
forward step-out
Sumo term: a winning move where the opponent steps out of the ring first, but the winner's own momentum carries them out as well, resulting in a loss.
The wrestler tried to force his opponent out but lost by a forward step-out.
He got too eager for a quick win and jumped the gun.
That remark turned out to be a case of jumping the gun.
I signed the contract too hastily out of eagerness and regretted it later.
The referee's overeager error caused the match to be halted.