The vocabulary problem
Teachers are seeing more emotional distress in classrooms than ever before. Most lack a shared vocabulary to describe it accurately to colleagues, parents, or themselves. Without that vocabulary, distress is named as defiance, withdrawal as laziness, panic as poor discipline.
What literacy is not
Mental health literacy is not turning every teacher into a counsellor. It is not diagnosing children. It is the ability to describe what you are seeing precisely enough that the right next step becomes obvious.
A minimum standard
Every staff body should be able to distinguish low mood from clinical depression, normal anxiety from panic, and behavioural distress from a behavioural disorder. Those distinctions decide whether a child gets a sanction or a referral.