Translation guide
The English word "bug" has several distinct meanings. This guide covers the most common ones for learners: insect, software error, listening device, and illness. Each meaning has different natural Japanese expressions.
A small insect or creepy-crawly.
There's a bug on the wall. · I got bitten by a bug. · Bugs are important for the ecosystem.
The general word for insect, bug, or worm. Covers most small creatures.
There's a bug in the kitchen.
虫が嫌いです。
I hate bugs.
Specifically refers to insects in the scientific sense (six-legged creatures). More formal or technical than 虫.
昆虫採集が趣味です。
Collecting insects is my hobby.
A flaw or error in a computer program or system.
There's a bug in the code. · We need to debug the program. · The update introduced a new bug.
The loanword from English, used universally in software contexts.
このアプリにはバグが多い。
This app has a lot of bugs.
バグを修正しました。
I fixed the bug.
A more formal term for malfunction, defect, or bug. Used in official reports or customer support.
A hidden microphone used for eavesdropping.
The spy planted a bug in the office. · They found a bug under the table. · The room was swept for bugs.
The standard term for a listening device or bug.
部屋に盗聴器が仕掛けられていた。
A bug was planted in the room.
Literally 'hidden microphone', a more descriptive phrase.
A minor illness, such as a cold or flu, often used informally.
I caught a bug and had to stay home. · There's a nasty bug going around. · I feel like I'm coming down with a bug.
The most common word for a cold. Use this when 'bug' means a cold.
風邪をひいた。
I caught a bug.
A more general phrase for a viral illness, often used when the exact illness is unknown.
何かのウイルス性の病気にかかったみたい。
I think I caught some kind of bug.
While 虫 means insect, it is not used for software bugs. Always use バグ or 不具合 in that context.
In casual English, 'bug' often means a minor illness. In Japanese, it's more natural to specify the illness (like 風邪) or use a phrase like 体調が悪い (not feeling well) rather than a direct translation.
お腹の調子が悪いみたい。
I think I have a stomach bug.
Japanese doesn't use 'bug' for stomach issues; describe the symptom instead.
そのソフトウェアには重大なバグがあります。
The software has a critical bug.
A bug has occurred in the system.
He recorded the conversation with a hidden bug.