How to say "jab" in Japanese

Choosing the right word

ジャブCommon
nounCovers the fighting sense: a quick, straight punch, especially in boxing and other combat sports. As a katakana loanword, ジャブ is what 'jab' means when a blow, not an injection, is intended.
注射ちゅうしゃJLPT N4approx.Common
noun, suru verb, transitive verbCovers the medical sense: an injection or shot, matching British 'jab' as in getting a jab at the clinic. This is the word for that sense; ジャブ does not apply.
流感りゅうかんの予防よぼうワクチンの注射ちゅうしゃをした。↗
I was vaccinated against the flu.

Use 「ジャブ」 for the punch sense of 'jab', a quick straight blow as in boxing; use 注射 when 'jab' means an injection or shot, the familiar British usage.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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