IPA: /ˈæl.aɪd/
KK: /ˈæl.aɪd/
Joined together or connected in a close relationship, often for a common purpose or goal. This term can also refer to things that are similar or related in nature.
The allied nations worked together to achieve peace.
Allied → It is formed from "all" (from Old English *aleggen*, meaning to bind or join) and "-ed" (a suffix indicating a state or condition). The word "allied" means in a state of being joined or bound together, particularly in a partnership or alliance.
Think of being 'joined' or 'bound' together, which is what 'allied' means.