1. to treat someone as if they were a child; to make someone seem childish or immature
Usage: British spelling; American equivalent is 'infantilize'; transitive verb

Examples

• The manager's constant corrections infantilised the experienced team members.
• Parents should avoid infantilising their teenagers by making all their decisions.
• The policy was criticized for infantilising disabled adults by limiting their autonomy.
• Speaking in a baby voice infantilises people who are perfectly capable of understanding complex ideas.
• The media coverage infantilised the political debate by oversimplifying the issues.