Refers to a single strike or hit, often in sports like golf or baseball, or in a physical attack.
彼の一打で試合が決まった。
The match was decided by his single stroke.
He hit a go-ahead shot in the ninth inning.
I sharpen my concentration with each stroke.
That putt decided the match with a single stroke.
The player landed a fierce blow on his opponent.
一発 is a casual, general word for one shot or hit (also slang for a home run), whereas 一打 is a more neutral, sport-specific term for a single stroke.
complete turnabout with a single hit; dramatic reversal from one swing
Standard kanji form; common in news contexts.
Numerical variant, often used in sports scores or headlines.
Compound of 一 (one) and 打 (strike, hit). The reading いちだ is a straightforward combination of the on'yomi readings.