1To mesh (as gears or cogs); to engage with each other so that parts fit and operate together.
歯車がきちんと噛み合っていないと機械が止まってしまう。
If the gears don't mesh properly, the machine will stop.
この小さな部品は隣の歯と噛み合うように設計されている。
This small part is designed to engage with the neighboring tooth.
2To bite each other (e.g., animals playfully or aggressively biting one another).
子犬たちが遊んで噛み合っている。
The puppies are playing and biting each other.
喧嘩になって二匹の犬が噛み合った。
A fight broke out and the two dogs bit each other.
3To be on the same wavelength; for opinions, ideas, or conversation to mesh (or not). Often used to say that things 'don't mesh' in the negative.
ミーティングで彼らの意見がまったく噛み合わなかった。
At the meeting, their opinions didn't mesh at all.
普段からよく話す同僚とは仕事の進め方が噛み合う。
A colleague I often talk with meshes well with me in approaches to work.
二人は波長が合っていて、会話がよく噛み合う。
The two are on the same wavelength and their conversations mesh well.