IPA: /ˈæntiˌtæŋk/
KK: /ˈæntiˌtæŋk/
This term describes something that is made to fight against or protect from armored vehicles, particularly tanks.
The army deployed antitank weapons to defend the base from enemy tanks.
Antitank is formed from "anti-" (meaning against) and "tank" (from the English word for an armored fighting vehicle). The word describes something that is designed to combat or counteract tanks.
Think of 'against' ('anti-') something like an armored vehicle ('tank') — that's why antitank refers to weapons or measures designed to fight tanks.